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THE TEXAS CONSTITUTION ARTICLE 1. BILL OF
RIGHTS
THE TEXAS CONSTITUTION
ARTICLE 1. BILL OF RIGHTS
Sec. 1. FREEDOM AND SOVEREIGNTY OF STATE. Texas is
a free and independent State, subject only to the Constitution of
the United States, and the maintenance of our free institutions
and the perpetuity of the Union depend upon the preservation of
the right of local self-government, unimpaired to all the States.
Sec. 2. INHERENT POLITICAL POWER; REPUBLICAN
FORM OF GOVERNMENT. All political power is inherent in
the people, and all free governments are founded on their
authority, and instituted for their benefit. The faith of the
people of Texas stands pledged to the preservation of a
republican form of government, and, subject to this limitation
only, they have at all times the inalienable right to alter, reform
or abolish their government in such manner as they may think
expedient.
Sec. 3. EQUAL RIGHTS. All free men, when they form a
social compact, have equal rights, and no man, or set of men, is
entitled to exclusive separate public emoluments, or privileges,
but in consideration of public services.
Sec. 3a. EQUALITY UNDER THE LAW. Equality under the
law shall not be denied or abridged because of sex, race, color,
creed, or national origin. This amendment is self-operative.
(Added Nov. 7, 1972.)
Sec. 4. RELIGIOUS TESTS. No religious test shall ever be
required as a qualification to any office, or public trust, in this
State; nor shall any one be excluded from holding office on
account of his religious sentiments, provided he acknowledge
the existence of a Supreme Being.
Sec. 5. WITNESSES NOT DISQUALIFIED BY RELIGIOUS
BELIEFS; OATHS AND AFFIRMATIONS. No person shall be
disqualified to give evidence in any of the Courts of this State
on account of his religious opinions, or for the want of any
religious belief, but all oaths or affirmations shall be
administered in the mode most binding upon the conscience, and
shall be taken subject to the pains and penalties of perjury.
Sec. 6. FREEDOM OF WORSHIP. All men have a natural and
indefeasible right to worship Almighty God according to the
dictates of their own consciences. No man shall be compelled
to attend, erect or support any place of worship, or to maintain
any ministry against his consent. No human authority ought, in
any case whatever, to control or interfere with the rights of
conscience in matters of religion, and no preference shall ever
be given by law to any religious society or mode of worship.
But it shall be the duty of the Legislature to pass such laws as
may be necessary to protect equally every religious
denomination in the peaceable enjoyment of its own mode of
public worship.
Sec. 7. APPROPRIATIONS FOR SECTARIAN PURPOSES.
No money shall be appropriated, or drawn from the Treasury for
the benefit of any sect, or religious society, theological or
religious seminary; nor shall property belonging to the State be
appropriated for any such purposes.
Sec. 8. FREEDOM OF SPEECH AND PRESS; LIBEL. Every
person shall be at liberty to speak, write or publish his opinions
on any subject, being responsible for the abuse of that privilege;
and no law shall ever be passed curtailing the liberty of speech
or of the press. In prosecutions for the publication of papers,
investigating the conduct of officers, or men in public capacity,
or when the matter published is proper for public information,
the truth thereof may be given in evidence. And in all
indictments for libels, the jury shall have the right to determine
the law and the facts, under the direction of the court, as in
other cases.
Sec. 9. SEARCHES AND SEIZURES. The people shall be
secure in their persons, houses, papers and possessions, from all
unreasonable seizures or searches, and no warrant to search any
place, or to seize any person or thing, shall issue without
describing them as near as may be, nor without probable cause,
supported by oath or affirmation.
Sec. 10. RIGHTS OF ACCUSED IN CRIMINAL
PROSECUTIONS. In all criminal prosecutions the accused
shall have a speedy public trial by an impartial jury. He shall
have the right to demand the nature and cause of the accusation
against him, and to have a copy thereof. He shall not be
compelled to give evidence against himself, and shall have the
right of being heard by himself or counsel, or both, shall be
confronted by the witnesses against him and shall have
compulsory process for obtaining witnesses in his favor, except
that when the witness resides out of the State and the offense
charged is a violation of any of the anti-trust laws of this State,
the defendant and the State shall have the right to produce and
have the evidence admitted by deposition, under such rules and
laws as the Legislature may hereafter provide; and no person
shall be held to answer for a criminal offense, unless on an
indictment of a grand jury, except in cases in which the
punishment is by fine or imprisonment, otherwise than in the
penitentiary, in cases of impeachment, and in cases arising in
the army or navy, or in the militia, when in actual service in
time of war or public danger.
(Amended Nov. 5, 1918.)
Sec. 12. HABEAS CORPUS. The writ of habeas corpus is a
writ of right, and shall never be suspended. The Legislature
shall enact laws to render the remedy speedy and effectual.
Sec. 13. EXCESSIVE BAIL OR FINES; CRUEL AND
UNUSUAL PUNISHMENT; REMEDY BY DUE COURSE OF
LAW. Excessive bail shall not be required, nor excessive fines
imposed, nor cruel or unusual punishment inflicted. All courts
shall be open, and every person for an injury done him, in his
lands, goods, person or reputation, shall have remedy by due
course of law.
Sec. 14. DOUBLE JEOPARDY. No person, for the same
offense, shall be twice put in jeopardy of life or liberty; nor
shall a person be again put upon trial for the same offense after
a verdict of not guilty in a court of competent jurisdiction.
Sec. 15. RIGHT OF TRIAL BY JURY. The right of trial by
jury shall remain inviolate. The Legislature shall pass such
laws as may be needed to regulate the same, and to maintain its
purity and efficiency. Provided, that the Legislature may
provide for the temporary commitment, for observation and/or
treatment, of mentally ill persons not charged with a criminal
offense, for a period of time not to exceed ninety (90) days, by
order of the County Court without the necessity of a trial by
jury.
(Amended Aug. 24, 1935.)
Sec. 15-a. COMMITMENT OF PERSONS OF UNSOUND
MIND. No person shall be committed as a person of unsound
mind except on competent medical or psychiatric testimony.
The Legislature may enact all laws necessary to provide for the
trial, adjudication of insanity and commitment of persons of
unsound mind and to provide for a method of appeal from
judgments rendered in such cases. Such laws may provide for a
waiver of trial by jury, in cases where the person under inquiry
has not been charged with the commission of a criminal offense,
by the concurrence of the person under inquiry, or his next of
kin, and an attorney ad litem appointed by a judge of either the
County or Probate Court of the county where the trial is being
held, and shall provide for a method of service of notice of such
trial upon the person under inquiry and of his right to demand a
trial by jury.
(Added Nov. 6, 1956.)
Sec. 16. BILLS OF ATTAINDER; EX POST FACTO OR
RETROACTIVE LAWS; IMPAIRING OBLIGATION OF
CONTRACTS. No bill of attainder, ex post facto law,
retroactive law, or any law impairing the obligation of
contracts, shall be made.
Sec. 17. TAKING, DAMAGING, OR DESTROYING
PROPERTY FOR PUBLIC USE; SPECIAL PRIVILEGES AND
IMMUNITIES; CONTROL OF PRIVILEGES AND
FRANCHISES. No person's property shall be taken, damaged
or destroyed for or applied to public use without adequate
compensation being made, unless by the consent of such person;
and, when taken, except for the use of the State, such
compensation shall be first made, or secured by a deposit of
money; and no irrevocable or uncontrollable grant of special
privileges or immunities, shall be made; but all privileges and
franchises granted by the Legislature, or created under its
authority shall be subject to the control thereof.
Sec. 18. IMPRISONMENT FOR DEBT. No person shall ever
be imprisoned for debt.
Sec. 19. DEPRIVATION OF LIFE, LIBERTY, ETC.; DUE
COURSE OF LAW. No citizen of this State shall be deprived
of life, liberty, property, privileges or immunities, or in any
manner disfranchised, except by the due course of the law of the
land.
Sec. 20. OUTLAWRY OR TRANSPORTATION FOR
OFFENSE. No citizen shall be outlawed. No person shall be
transported out of the State for any offense committed within
the same. This section does not prohibit an agreement with
another state providing for the confinement of inmates of this
State in the penal or correctional facilities of that state.
(Amended Nov. 5, 1985.)
Sec. 21. CORRUPTION OF BLOOD; FORFEITURE;
SUICIDES. No conviction shall work corruption of blood, or
forfeiture of estate, and the estates of those who destroy their
own lives shall descend or vest as in case of natural death.
Sec. 22. TREASON. Treason against the State shall consist
only in levying war against it, or adhering to its enemies, giving
them aid and comfort; and no person shall be convicted of
treason except on the testimony of two witnesses to the same
overt act, or on confession in open court.
Sec. 23. RIGHT TO KEEP AND BEAR ARMS. Every citizen
shall have the right to keep and bear arms in the lawful defense
of himself or the State; but the Legislature shall have power, by
law, to regulate the wearing of arms, with a view to prevent
crime.
Sec. 24. MILITARY SUBORDINATE TO CIVIL AUTHORITY.
The military shall at all times be subordinate to the civil
authority.
Sec. 25. QUARTERING SOLDIERS IN HOUSES. No soldier
shall in time of peace be quartered in the house of any citizen
without the consent of the owner, nor in time of war but in a
manner prescribed by law.
Sec. 26. PERPETUITIES AND MONOPOLIES;
PRIMOGENITURE OR ENTAILMENTS. Perpetuities and
monopolies are contrary to the genius of a free government, and
shall never be allowed, nor shall the law of primogeniture or
entailments ever be in force in this State.
Sec. 27. RIGHT OF ASSEMBLY; PETITION FOR REDRESS
OF GRIEVANCES. The citizens shall have the right, in a
peaceable manner, to assemble together for their common good;
and apply to those invested with the powers of government for
redress of grievances or other purposes, by petition, address or
remonstrance.
Sec. 28. SUSPENSION OF LAWS. No power of suspending
laws in this State shall be exercised except by the Legislature.
Sec. 29. PROVISIONS OF BILL OF RIGHTS EXCEPTED
FROM POWERS OF GOVERNMENT; TO FOREVER REMAIN
INVIOLATE. To guard against transgressions of the high
powers herein delegated, we declare that everything in this "Bill
of Rights" is excepted out of the general powers of government,
and shall forever remain inviolate, and all laws contrary thereto,
or to the following provisions, shall be void.
Sec. 30. RIGHTS OF CRIME VICTIMS.
(a) A crime victim has the following rights:
(1) the right to be treated with fairness and with respect for the
victim's dignity and privacy throughout the criminal justice
process; and
(2) the right to be reasonably protected from the accused
throughout the criminal justice process.
(b) On the request of a crime victim, the crime victim has the
following rights:
(1) the right to notification of court proceedings;
(2) the right to be present at all public court proceedings
related to the offense, unless the victim is to testify and the
court determines that the victim's testimony would be materially
affected if the victim hears other testimony at the trial;
(3) the right to confer with a representative of the prosecutor's
office;
(4) the right to restitution; and
(5) the right to information about the conviction, sentence,
imprisonment, and release of the accused.
(c) The legislature may enact laws to define the term "victim"
and to enforce these and other rights of crime victims.
(d) The state, through its prosecuting attorney, has the right to
enforce the rights of crime victims.
(e) The legislature may enact laws to provide that a judge,
attorney for the state, peace officer, or law enforcement agency
is not liable for a failure or inability to provide a right
enumerated in this section. The failure or inability of any
person to provide a right or service enumerated in this section
may not be used by a defendant in a criminal case as a ground
for appeal or post-conviction writ of habeas corpus. A victim
or guardian or legal representative of a victim has standing to
enforce the rights enumerated in this section but does not have
standing to participate as a party in a criminal proceeding or to
contest the disposition of any charge. (Added Nov. 7, 1989.)
Sec. 32. MARRIAGE.
(a) Marriage in this state shall consist only of the union of one
man and one woman.
(b) This state or a political subdivision of this state may not
create or recognize any legal status identical or similar to
marriage. (Added Nov. 8, 2005.)
Page - 1 -
Copyright © 2016 John Wiley & Sons, Inc.
Chapter 7 - Just-in-Time (JIT) and Lean Systems
Operations Management
6th Edition
R. Dan Reid & Nada R. Sanders
*
*
Copyright © 2016 John Wiley & Sons, Inc.
Copyright © 2016 John Wiley & Sons, Inc.
Copyright © 2016 John Wiley & Sons, Inc.
Learning ObjectivesExplain the core beliefs of the just-in-time
(JIT) philosophy.Describe the elements of JIT.Explain the key
elements of JIT manufacturing.Explain the elements of total
quality management (TGM) and their role in JIT.
*
Copyright © 2016 John Wiley & Sons, Inc.
Learning Objectives - cont'dDescribe the role of people in JIT
and why respect for people is so important.Describe the benefi
ts of JIT.Discuss the implementation process of a successful JIT
system.Describe the impact of JIT on service and manufacturing
organizations.
*
Copyright © 2016 John Wiley & Sons, Inc.
Just-in-Time (JIT)JIT philosophy means getting the right
quantity of goods at the right place and the right timeJIT
exceeds the concept of inventory reduction; it is an all-
encompassing philosophy geared to eliminate waste, anything
that does not add valueA broad JIT view – or lean
production/lean systems - is one that encompasses the entire
organization
*
Copyright © 2016 John Wiley & Sons, Inc.
Philosophy of JITJIT originated in Japan at Toyota Motor Co,
fueled by a need to survive the devastation post WWII JIT
gained worldwide prominence in the 1970sOften termed “Lean
Production” or “Lean Systems”Broad view that entire
organization has the same goal - to serve customers
*
Copyright © 2016 John Wiley & Sons, Inc.
Defining beliefs of JITEveryone should have a broad view of
the organization and work toward the same goal, which is
serving the customerJIT is built on simplicity - simpler is
betterContinuous improvement – often using kaizen
blitzVisibility – all waste must be visible to be identified and
eliminatedFlexibility - to adapt to changes in environment
*
Copyright © 2016 John Wiley & Sons, Inc.
Three Elements of JIT
*
Copyright © 2016 John Wiley & Sons, Inc.
Three Elements of JIT - cont'dJIT manufacturing focuses on
production system to achieve value-added manufacturingTQM is
an integrated effort designed to improve quality performance at
every levelRespect for people rests on the philosophy that
human resources are an essential part of JIT philosophy
*
Role of Inventory ReductionInventory = Lead Time (less is
better)Inventory hides problems
*
Copyright © 2016 John Wiley & Sons, Inc.
Elements of JIT ManufacturingJIT Manufacturing is a
philosophy of value-added manufacturingAchieved by focusing
on these elements:Inventory reduction - exposes
problemsKanbans & pull production systemsSmall lots sizes &
quick setupsUniform plant loadingFlexible resourcesEfficient
facility layouts
*
Copyright © 2016 John Wiley & Sons, Inc.
JIT Manufacturing: The Pull System
*
Number of Kanbans Required
N = number of containers
D = demand rate at the withdraw station
T = lead time from supply station
C = container size
S = safety stock
*
*
Computing the Number of Kanbans: an aspirin manufacturer has
converted to JIT manufacturing using kanban containers. They
must determine the number of containers at the bottle filling
operation which fills at a rate of 200 per hour. Each container
holds 25 bottles, it takes 30 minutes to receive more bottles,
safety stock is 10% of demand during LT.
Tip: round up = would provide additional slack
round down = need to make improvements in operations
Copyright © 2016 John Wiley & Sons, Inc.
Variations on Kanban ProductionKanban boxes space on factory
floor for storing suppliesFlags (signal kanban)used to indicate
when supplies need to be orderedSupplier kanbans brings filled
containers to point of usage in factory/picks up empty
containers
*
Copyright © 2016 John Wiley & Sons, Inc.
Small Lot Sizes & Quick SetupsSmall lots mean less average
inventory and shorten manufacturing lead timeSmall lots with
shorter setup times increase flexibility to respond to demand
changes Strive for single digit setups- < 10 minutesSetup
reduction process is well-documentedExternal setup- do as
much preparation while present job is still running; thus can be
performed while machine is still runningInternal setup-
simplify, eliminate, shorten steps involved with location,
clamping, & adjustments; requires the machine to be stopped in
order to be performedUltimate goal is single unit lot sizes
*
Uniform Plant LoadingA “level” schedule is developed so that
the same mix of products is made every day in small quantities
Leveling the schedule can have big impact along whole supply
chain
*
Copyright © 2016 John Wiley & Sons, Inc.
Flexible ResourcesMoveable, general purpose
equipment:Portable equipment with plug in power/airDrills,
lathes, printer-fax-copiers, etc.Capable of being setup to do
many different things with minimal setup timeMultifunctional
workers: Workers assume considerable responsibilityCross-
trained to perform several different dutiesTrained to also be
problem solvers
*
Copyright © 2016 John Wiley & Sons, Inc.
Facility LayoutsWorkstations in close physical proximity to
reduce transport & movementStreamlined flow of materialOften
use:Cell Manufacturing Placement of dissimilar machines and
equipment together to produce a family of products with similar
processing requirementsU-shaped linesallows material handler
to quickly drop off materials & pick up finished work;
flexibility
*
Copyright © 2016 John Wiley & Sons, Inc.
TQMProduct versus processQuality in JIT is centered on
building quality into the processQuality at the source -
sequential inspectionJidoka - authority to stop linePoka-yoke -
fail-safe all processesPreventative Maintenance:Regular
inspections and maintenance to keep machines
operationalCostly, yes but less expensive than unexpected
machine breakage.Work environmentperform maintenance as
part of their regular workCare of equipment and well-trained
workers are very important.
*
Copyright © 2016 John Wiley & Sons, Inc.
Respect for People
The Role of Employees:Genuine and meaningful respect for
employeesWillingness to develop cross-functional
skillsAssociates gather performance data; make production and
quality decisionsBottom-round managementconsensus
management by committees or teamsQuality circlessmall
volunteer teams that solve quality problemsEveryone is
responsible for Quality and preventive maintenance
*
Copyright © 2016 John Wiley & Sons, Inc.
Respect for People - cont’d
Lifetime Employment:Everyone feels secure/is
empoweredEveryone is responsible for quality: understand both
internal and external customer needs
*
Copyright © 2016 John Wiley & Sons, Inc.
Respect for People cont’d
The Role of Management:Responsible for culture of mutual
trustServe as coaches & facilitatorsResponsible for developing
workersProvide multi-functional trainingFacilitate
teamworkSupport culture with appropriate incentive system
including non-monetary
*
Copyright © 2016 John Wiley & Sons, Inc.
Respect for People - cont’d
Supplier RelationshipsSingle-source suppliers Can supply entire
family of parts; external factoryBuild long-term relationships
with small number of suppliersSuppliers locate near
customerFewer contractsCost and information sharingWork
together to certify processes
*
Copyright © 2016 John Wiley & Sons, Inc.
Benefits of JIT Reduction in inventoriesImproved quality
Reduced space requirementsShorter lead timesLower production
costsIncreased productivityIncreased machine utilizationGreater
flexibility
*
Copyright © 2016 John Wiley & Sons, Inc.
Implementing JITStarts with a company shared vision of where
it is and where it wants to goManagement needs to create the
right atmosphereImplementation needs a designated
“Champion”
*
Copyright © 2016 John Wiley & Sons, Inc.
Implementing JIT – cont'd
Implement the sequence of seven steps:
Make quality improvements
Reorganize workplace
Reduce setup times
Reduce lot sizes & lead times
Implement layout changes
Switch to pull production
Develop relationship with suppliers
*
Copyright © 2016 John Wiley & Sons, Inc.
JIT in Services
Many JIT concepts also apply to Service companies
Improved quality such as timeliness, service consistency, and
courtesy
Uniform facility loading to provide better service
responsiveness
Use of multifunction workers
Reduction in cycle time
Minimizing setup times and parallel processing
Workplace organization
*
Copyright © 2016 John Wiley & Sons, Inc.
JIT & Lean Systems: How it all Fits Together
JIT: an overriding philosophy that affects all other business
decisions
Quality improvements (chs 5 & 6)
Partnering with suppliers (ch 4)
Changing job designs (ch 11)
Facility layout (ch 10)
Changes in production process (ch 3)
Changes in inventory (ch 12)
*
Copyright © 2016 John Wiley & Sons, Inc.
JIT Across the Organization
JIT eliminates organizational barriers and improves
communications
Accounting changes or relies on activity-based
costingMarketing by interfacing with the customersFinance
approves and evaluates financial investmentsInformation
systems create the network of information necessary for JIT to
function
*
Copyright © 2016 John Wiley & Sons, Inc.
Chapter 7 Highlights
JIT is a philosophy that was developed by the Toyota Motor
Company in the mid-1970s. It has become the standard for
many industries by focusing on simplicity, eliminating waste,
taking a broad view of operations, visibility, and flexibility.
Three key elements of this philosophy are JIT manufacturing,
total quality management, and respect for people.
JIT views waste as anything that does not add value.
*
Copyright © 2016 John Wiley & Sons, Inc.
Chapter 7 Highlights - cont’dTraditional manufacturing systems
use “push” production; JIT uses “pull” production. Push
systems anticipate future demand and produce in advance in
order to have products in place when demand occurs. Pull
systems work backwards. The last workstation in the
production line requests the precise amounts of materials
required.
*
Copyright © 2016 John Wiley & Sons, Inc.
Chapter 7 Highlights - cont'dJIT manufacturing is a coordinated
production system that enables the right quantities of parts to
arrive when/where they are needed. Key elements of JIT
manufacturing are the pull system and kanban production, small
lot sizes and quick setups, uniform plant loading, flexible
resources, and streamlined layout.
*
Copyright © 2016 John Wiley & Sons, Inc.
Chapter 7 Highlights - cont'dTQM creates an organizational
culture that defines quality as seen by the customer. The
concepts of continuous improvement and quality at the source
are integral to allowing for continual growth and the goal of
identifying the causes of quality problems.
*
Copyright © 2016 John Wiley & Sons, Inc.
Chapter 7 Highlights - cont'dJIT considers people to be the
organization’s most important resource.JIT is equally applicable
in service organizations, particularly with the push toward time-
based competition and the need to cut costs.JIT success is
dependent on inter-functional coordination and effort.
*
C
S
DT
+
=
N
down?
or
up
round
:
Question
containers
kanban
4.4
25
10
(200)(.5)
C
S
DT
N
bottles
10
.5)
0.10(200)(
d)(T)
0.10(deman
S
container
per
bottles
25
C
hour
.5
minutes
30
T
hour
per
bottles
200
D
:
Solution
=
+
=
+
=
=
=
=
=
=
=
=
Copyright © 2016 John Wiley & Sons, Inc.
Chapter 6 - Statistical Quality Control (SQC)
Operations Management
6th Edition
R. Dan Reid & Nada R. Sanders
*
*
Copyright © 2016 John Wiley & Sons, Inc.
Copyright © 2016 John Wiley & Sons, Inc.
Copyright © 2016 John Wiley & Sons, Inc.
Learning ObjectivesDescribe categories of statistical quality
control (SQC).Identify and describe causes of variation.Explain
the use of descriptive statistics in measuring quality
characteristics.Describe the use of control charts.Identify the
differences between x-bar and R-charts.
*
Copyright © 2016 John Wiley & Sons, Inc.
Learning Objectives - cont'dIdentify the differences between p-
and c-charts.Explain the meaning of process capability and the
process capability index.Explain the concept Six Sigma.Explain
the process of acceptance sampling and describe the use of
operating characteristic (OC) curves.Identify decisions that
managers must make when implementing SPC.Describe the
challenges inherent in measuring quality in service
organizations.
*
Copyright © 2016 John Wiley & Sons, Inc.
What is SQC?
Statistical Quality Control (SQC)
the term used to describe the set of statistical tools used by
quality professionals to evaluate organizational quality.
*
Copyright © 2016 John Wiley & Sons, Inc.
3 Categories of SQC
Statistical process control (SPC) inspecting a random sample of
an output from process, within range and functioning properly
Descriptive statistics the mean, standard deviation, and range
Involve inspecting the output from a process
Quality characteristics are measured and charted
Helps identify in-process variations
Acceptance sampling used to randomly inspect a batch of goods
to determine acceptance/rejection
Does not help to catch in-process problems
*
Copyright © 2016 John Wiley & Sons, Inc.
Sources of VariationVariation exists in all processes.Variation
can be categorized as either:Common or Random causes of
variation, orRandom causes that we cannot identifyUnavoidable,
i.e.; slight differences in process variables like diameter,
weight, service time, temperatureAssignable causes of
variationCauses can be identified Eliminate cause i.e.; poor
employee training, worn tool, machine needing repair
*
Copyright © 2016 John Wiley & Sons, Inc.
Descriptive Statistics
The Mean- measure of central tendency
The Range- difference between largest/smallest observations in
a set of data
Standard Deviation measures the amount of data dispersion
around mean
Distribution of Data shapeNormal or bell shaped orSkewed
*
Copyright © 2016 John Wiley & Sons, Inc.
Distribution of Data
Normal distributions
Skewed distribution
*
Copyright © 2016 John Wiley & Sons, Inc.
SPC Methods-Developing Control Charts
Control Charts (aka process or QC charts) show sample data
plotted on a graph with CL, UCL, and LCL
Control chart for variables are used to monitor characteristics
that can be measured, e.g. length, weight, diameter, time
Control charts for attributes are used to monitor characteristics
that have discrete values and can be counted, e.g. % defective, #
of flaws in a shirt, etc.
*
Copyright © 2016 John Wiley & Sons, Inc.
Setting Control Limits
*
*
Copyright © 2016 John Wiley & Sons, Inc.
Copyright © 2016 John Wiley & Sons, Inc.
Control Charts for VariablesUse x-Bar and R-bar charts
togetherUsed to monitor different variablesx-Bar and R-bar
charts reveal different problemsWhat is the statistical control
difference from one chart to the next?
*
Copyright © 2016 John Wiley & Sons, Inc.
Control Charts for VariablesUse x-Bar charts to monitor the
changes in the mean of a process (central tendencies)Use R-bar
charts to monitor the dispersion or variability of the process
System can show acceptable central tendencies but unacceptable
variability System can show acceptable variability but
unacceptable central tendencies
*
Copyright © 2016 John Wiley & Sons, Inc.
Constructing an x-Bar Chart: A quality control inspector at the
Cocoa Fizz soft drink company has taken three samples with
four observations each of the volume of bottles filled. If the
standard deviation of the bottling operation is .2 ounces, use the
below data to develop control charts with limits of 3 standard
deviations for the 16 oz. bottling operation.
*
Center line and control limit formulasTime 1Time 2Time
3Observation 115.816.116.0Observation
216.016.015.9Observation 315.815.815.9Observation
415.915.915.8Sample means (X-bar)15.87515.97515.9Sample
ranges (R)0.20.30.2
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  • 1. THE TEXAS CONSTITUTION ARTICLE 1. BILL OF RIGHTS THE TEXAS CONSTITUTION ARTICLE 1. BILL OF RIGHTS Sec. 1. FREEDOM AND SOVEREIGNTY OF STATE. Texas is a free and independent State, subject only to the Constitution of the United States, and the maintenance of our free institutions and the perpetuity of the Union depend upon the preservation of the right of local self-government, unimpaired to all the States. Sec. 2. INHERENT POLITICAL POWER; REPUBLICAN FORM OF GOVERNMENT. All political power is inherent in the people, and all free governments are founded on their authority, and instituted for their benefit. The faith of the people of Texas stands pledged to the preservation of a republican form of government, and, subject to this limitation only, they have at all times the inalienable right to alter, reform or abolish their government in such manner as they may think expedient. Sec. 3. EQUAL RIGHTS. All free men, when they form a social compact, have equal rights, and no man, or set of men, is entitled to exclusive separate public emoluments, or privileges, but in consideration of public services. Sec. 3a. EQUALITY UNDER THE LAW. Equality under the law shall not be denied or abridged because of sex, race, color, creed, or national origin. This amendment is self-operative. (Added Nov. 7, 1972.) Sec. 4. RELIGIOUS TESTS. No religious test shall ever be required as a qualification to any office, or public trust, in this
  • 2. State; nor shall any one be excluded from holding office on account of his religious sentiments, provided he acknowledge the existence of a Supreme Being. Sec. 5. WITNESSES NOT DISQUALIFIED BY RELIGIOUS BELIEFS; OATHS AND AFFIRMATIONS. No person shall be disqualified to give evidence in any of the Courts of this State on account of his religious opinions, or for the want of any religious belief, but all oaths or affirmations shall be administered in the mode most binding upon the conscience, and shall be taken subject to the pains and penalties of perjury. Sec. 6. FREEDOM OF WORSHIP. All men have a natural and indefeasible right to worship Almighty God according to the dictates of their own consciences. No man shall be compelled to attend, erect or support any place of worship, or to maintain any ministry against his consent. No human authority ought, in any case whatever, to control or interfere with the rights of conscience in matters of religion, and no preference shall ever be given by law to any religious society or mode of worship. But it shall be the duty of the Legislature to pass such laws as may be necessary to protect equally every religious denomination in the peaceable enjoyment of its own mode of public worship. Sec. 7. APPROPRIATIONS FOR SECTARIAN PURPOSES. No money shall be appropriated, or drawn from the Treasury for the benefit of any sect, or religious society, theological or religious seminary; nor shall property belonging to the State be appropriated for any such purposes. Sec. 8. FREEDOM OF SPEECH AND PRESS; LIBEL. Every person shall be at liberty to speak, write or publish his opinions on any subject, being responsible for the abuse of that privilege; and no law shall ever be passed curtailing the liberty of speech or of the press. In prosecutions for the publication of papers,
  • 3. investigating the conduct of officers, or men in public capacity, or when the matter published is proper for public information, the truth thereof may be given in evidence. And in all indictments for libels, the jury shall have the right to determine the law and the facts, under the direction of the court, as in other cases. Sec. 9. SEARCHES AND SEIZURES. The people shall be secure in their persons, houses, papers and possessions, from all unreasonable seizures or searches, and no warrant to search any place, or to seize any person or thing, shall issue without describing them as near as may be, nor without probable cause, supported by oath or affirmation. Sec. 10. RIGHTS OF ACCUSED IN CRIMINAL PROSECUTIONS. In all criminal prosecutions the accused shall have a speedy public trial by an impartial jury. He shall have the right to demand the nature and cause of the accusation against him, and to have a copy thereof. He shall not be compelled to give evidence against himself, and shall have the right of being heard by himself or counsel, or both, shall be confronted by the witnesses against him and shall have compulsory process for obtaining witnesses in his favor, except that when the witness resides out of the State and the offense charged is a violation of any of the anti-trust laws of this State, the defendant and the State shall have the right to produce and have the evidence admitted by deposition, under such rules and laws as the Legislature may hereafter provide; and no person shall be held to answer for a criminal offense, unless on an indictment of a grand jury, except in cases in which the punishment is by fine or imprisonment, otherwise than in the penitentiary, in cases of impeachment, and in cases arising in the army or navy, or in the militia, when in actual service in time of war or public danger. (Amended Nov. 5, 1918.)
  • 4. Sec. 12. HABEAS CORPUS. The writ of habeas corpus is a writ of right, and shall never be suspended. The Legislature shall enact laws to render the remedy speedy and effectual. Sec. 13. EXCESSIVE BAIL OR FINES; CRUEL AND UNUSUAL PUNISHMENT; REMEDY BY DUE COURSE OF LAW. Excessive bail shall not be required, nor excessive fines imposed, nor cruel or unusual punishment inflicted. All courts shall be open, and every person for an injury done him, in his lands, goods, person or reputation, shall have remedy by due course of law. Sec. 14. DOUBLE JEOPARDY. No person, for the same offense, shall be twice put in jeopardy of life or liberty; nor shall a person be again put upon trial for the same offense after a verdict of not guilty in a court of competent jurisdiction. Sec. 15. RIGHT OF TRIAL BY JURY. The right of trial by jury shall remain inviolate. The Legislature shall pass such laws as may be needed to regulate the same, and to maintain its purity and efficiency. Provided, that the Legislature may provide for the temporary commitment, for observation and/or treatment, of mentally ill persons not charged with a criminal offense, for a period of time not to exceed ninety (90) days, by order of the County Court without the necessity of a trial by jury. (Amended Aug. 24, 1935.) Sec. 15-a. COMMITMENT OF PERSONS OF UNSOUND MIND. No person shall be committed as a person of unsound mind except on competent medical or psychiatric testimony. The Legislature may enact all laws necessary to provide for the trial, adjudication of insanity and commitment of persons of unsound mind and to provide for a method of appeal from judgments rendered in such cases. Such laws may provide for a
  • 5. waiver of trial by jury, in cases where the person under inquiry has not been charged with the commission of a criminal offense, by the concurrence of the person under inquiry, or his next of kin, and an attorney ad litem appointed by a judge of either the County or Probate Court of the county where the trial is being held, and shall provide for a method of service of notice of such trial upon the person under inquiry and of his right to demand a trial by jury. (Added Nov. 6, 1956.) Sec. 16. BILLS OF ATTAINDER; EX POST FACTO OR RETROACTIVE LAWS; IMPAIRING OBLIGATION OF CONTRACTS. No bill of attainder, ex post facto law, retroactive law, or any law impairing the obligation of contracts, shall be made. Sec. 17. TAKING, DAMAGING, OR DESTROYING PROPERTY FOR PUBLIC USE; SPECIAL PRIVILEGES AND IMMUNITIES; CONTROL OF PRIVILEGES AND FRANCHISES. No person's property shall be taken, damaged or destroyed for or applied to public use without adequate compensation being made, unless by the consent of such person; and, when taken, except for the use of the State, such compensation shall be first made, or secured by a deposit of money; and no irrevocable or uncontrollable grant of special privileges or immunities, shall be made; but all privileges and franchises granted by the Legislature, or created under its authority shall be subject to the control thereof. Sec. 18. IMPRISONMENT FOR DEBT. No person shall ever be imprisoned for debt. Sec. 19. DEPRIVATION OF LIFE, LIBERTY, ETC.; DUE COURSE OF LAW. No citizen of this State shall be deprived of life, liberty, property, privileges or immunities, or in any
  • 6. manner disfranchised, except by the due course of the law of the land. Sec. 20. OUTLAWRY OR TRANSPORTATION FOR OFFENSE. No citizen shall be outlawed. No person shall be transported out of the State for any offense committed within the same. This section does not prohibit an agreement with another state providing for the confinement of inmates of this State in the penal or correctional facilities of that state. (Amended Nov. 5, 1985.) Sec. 21. CORRUPTION OF BLOOD; FORFEITURE; SUICIDES. No conviction shall work corruption of blood, or forfeiture of estate, and the estates of those who destroy their own lives shall descend or vest as in case of natural death. Sec. 22. TREASON. Treason against the State shall consist only in levying war against it, or adhering to its enemies, giving them aid and comfort; and no person shall be convicted of treason except on the testimony of two witnesses to the same overt act, or on confession in open court. Sec. 23. RIGHT TO KEEP AND BEAR ARMS. Every citizen shall have the right to keep and bear arms in the lawful defense of himself or the State; but the Legislature shall have power, by law, to regulate the wearing of arms, with a view to prevent crime. Sec. 24. MILITARY SUBORDINATE TO CIVIL AUTHORITY. The military shall at all times be subordinate to the civil authority. Sec. 25. QUARTERING SOLDIERS IN HOUSES. No soldier shall in time of peace be quartered in the house of any citizen without the consent of the owner, nor in time of war but in a
  • 7. manner prescribed by law. Sec. 26. PERPETUITIES AND MONOPOLIES; PRIMOGENITURE OR ENTAILMENTS. Perpetuities and monopolies are contrary to the genius of a free government, and shall never be allowed, nor shall the law of primogeniture or entailments ever be in force in this State. Sec. 27. RIGHT OF ASSEMBLY; PETITION FOR REDRESS OF GRIEVANCES. The citizens shall have the right, in a peaceable manner, to assemble together for their common good; and apply to those invested with the powers of government for redress of grievances or other purposes, by petition, address or remonstrance. Sec. 28. SUSPENSION OF LAWS. No power of suspending laws in this State shall be exercised except by the Legislature. Sec. 29. PROVISIONS OF BILL OF RIGHTS EXCEPTED FROM POWERS OF GOVERNMENT; TO FOREVER REMAIN INVIOLATE. To guard against transgressions of the high powers herein delegated, we declare that everything in this "Bill of Rights" is excepted out of the general powers of government, and shall forever remain inviolate, and all laws contrary thereto, or to the following provisions, shall be void. Sec. 30. RIGHTS OF CRIME VICTIMS. (a) A crime victim has the following rights: (1) the right to be treated with fairness and with respect for the victim's dignity and privacy throughout the criminal justice process; and (2) the right to be reasonably protected from the accused throughout the criminal justice process.
  • 8. (b) On the request of a crime victim, the crime victim has the following rights: (1) the right to notification of court proceedings; (2) the right to be present at all public court proceedings related to the offense, unless the victim is to testify and the court determines that the victim's testimony would be materially affected if the victim hears other testimony at the trial; (3) the right to confer with a representative of the prosecutor's office; (4) the right to restitution; and (5) the right to information about the conviction, sentence, imprisonment, and release of the accused. (c) The legislature may enact laws to define the term "victim" and to enforce these and other rights of crime victims. (d) The state, through its prosecuting attorney, has the right to enforce the rights of crime victims. (e) The legislature may enact laws to provide that a judge, attorney for the state, peace officer, or law enforcement agency is not liable for a failure or inability to provide a right enumerated in this section. The failure or inability of any person to provide a right or service enumerated in this section may not be used by a defendant in a criminal case as a ground for appeal or post-conviction writ of habeas corpus. A victim or guardian or legal representative of a victim has standing to enforce the rights enumerated in this section but does not have standing to participate as a party in a criminal proceeding or to contest the disposition of any charge. (Added Nov. 7, 1989.)
  • 9. Sec. 32. MARRIAGE. (a) Marriage in this state shall consist only of the union of one man and one woman. (b) This state or a political subdivision of this state may not create or recognize any legal status identical or similar to marriage. (Added Nov. 8, 2005.) Page - 1 - Copyright © 2016 John Wiley & Sons, Inc. Chapter 7 - Just-in-Time (JIT) and Lean Systems Operations Management 6th Edition R. Dan Reid & Nada R. Sanders * * Copyright © 2016 John Wiley & Sons, Inc. Copyright © 2016 John Wiley & Sons, Inc. Copyright © 2016 John Wiley & Sons, Inc. Learning ObjectivesExplain the core beliefs of the just-in-time (JIT) philosophy.Describe the elements of JIT.Explain the key
  • 10. elements of JIT manufacturing.Explain the elements of total quality management (TGM) and their role in JIT. * Copyright © 2016 John Wiley & Sons, Inc. Learning Objectives - cont'dDescribe the role of people in JIT and why respect for people is so important.Describe the benefi ts of JIT.Discuss the implementation process of a successful JIT system.Describe the impact of JIT on service and manufacturing organizations. * Copyright © 2016 John Wiley & Sons, Inc. Just-in-Time (JIT)JIT philosophy means getting the right quantity of goods at the right place and the right timeJIT exceeds the concept of inventory reduction; it is an all- encompassing philosophy geared to eliminate waste, anything that does not add valueA broad JIT view – or lean production/lean systems - is one that encompasses the entire organization * Copyright © 2016 John Wiley & Sons, Inc. Philosophy of JITJIT originated in Japan at Toyota Motor Co, fueled by a need to survive the devastation post WWII JIT gained worldwide prominence in the 1970sOften termed “Lean Production” or “Lean Systems”Broad view that entire organization has the same goal - to serve customers *
  • 11. Copyright © 2016 John Wiley & Sons, Inc. Defining beliefs of JITEveryone should have a broad view of the organization and work toward the same goal, which is serving the customerJIT is built on simplicity - simpler is betterContinuous improvement – often using kaizen blitzVisibility – all waste must be visible to be identified and eliminatedFlexibility - to adapt to changes in environment * Copyright © 2016 John Wiley & Sons, Inc. Three Elements of JIT * Copyright © 2016 John Wiley & Sons, Inc. Three Elements of JIT - cont'dJIT manufacturing focuses on production system to achieve value-added manufacturingTQM is an integrated effort designed to improve quality performance at every levelRespect for people rests on the philosophy that human resources are an essential part of JIT philosophy * Role of Inventory ReductionInventory = Lead Time (less is better)Inventory hides problems * Copyright © 2016 John Wiley & Sons, Inc.
  • 12. Elements of JIT ManufacturingJIT Manufacturing is a philosophy of value-added manufacturingAchieved by focusing on these elements:Inventory reduction - exposes problemsKanbans & pull production systemsSmall lots sizes & quick setupsUniform plant loadingFlexible resourcesEfficient facility layouts * Copyright © 2016 John Wiley & Sons, Inc. JIT Manufacturing: The Pull System * Number of Kanbans Required N = number of containers D = demand rate at the withdraw station T = lead time from supply station C = container size S = safety stock * * Computing the Number of Kanbans: an aspirin manufacturer has converted to JIT manufacturing using kanban containers. They must determine the number of containers at the bottle filling operation which fills at a rate of 200 per hour. Each container holds 25 bottles, it takes 30 minutes to receive more bottles, safety stock is 10% of demand during LT. Tip: round up = would provide additional slack
  • 13. round down = need to make improvements in operations Copyright © 2016 John Wiley & Sons, Inc. Variations on Kanban ProductionKanban boxes space on factory floor for storing suppliesFlags (signal kanban)used to indicate when supplies need to be orderedSupplier kanbans brings filled containers to point of usage in factory/picks up empty containers * Copyright © 2016 John Wiley & Sons, Inc. Small Lot Sizes & Quick SetupsSmall lots mean less average inventory and shorten manufacturing lead timeSmall lots with shorter setup times increase flexibility to respond to demand changes Strive for single digit setups- < 10 minutesSetup reduction process is well-documentedExternal setup- do as much preparation while present job is still running; thus can be performed while machine is still runningInternal setup- simplify, eliminate, shorten steps involved with location, clamping, & adjustments; requires the machine to be stopped in order to be performedUltimate goal is single unit lot sizes * Uniform Plant LoadingA “level” schedule is developed so that the same mix of products is made every day in small quantities Leveling the schedule can have big impact along whole supply chain *
  • 14. Copyright © 2016 John Wiley & Sons, Inc. Flexible ResourcesMoveable, general purpose equipment:Portable equipment with plug in power/airDrills, lathes, printer-fax-copiers, etc.Capable of being setup to do many different things with minimal setup timeMultifunctional workers: Workers assume considerable responsibilityCross- trained to perform several different dutiesTrained to also be problem solvers * Copyright © 2016 John Wiley & Sons, Inc. Facility LayoutsWorkstations in close physical proximity to reduce transport & movementStreamlined flow of materialOften use:Cell Manufacturing Placement of dissimilar machines and equipment together to produce a family of products with similar processing requirementsU-shaped linesallows material handler to quickly drop off materials & pick up finished work; flexibility * Copyright © 2016 John Wiley & Sons, Inc. TQMProduct versus processQuality in JIT is centered on building quality into the processQuality at the source - sequential inspectionJidoka - authority to stop linePoka-yoke - fail-safe all processesPreventative Maintenance:Regular inspections and maintenance to keep machines operationalCostly, yes but less expensive than unexpected machine breakage.Work environmentperform maintenance as part of their regular workCare of equipment and well-trained workers are very important.
  • 15. * Copyright © 2016 John Wiley & Sons, Inc. Respect for People The Role of Employees:Genuine and meaningful respect for employeesWillingness to develop cross-functional skillsAssociates gather performance data; make production and quality decisionsBottom-round managementconsensus management by committees or teamsQuality circlessmall volunteer teams that solve quality problemsEveryone is responsible for Quality and preventive maintenance * Copyright © 2016 John Wiley & Sons, Inc. Respect for People - cont’d Lifetime Employment:Everyone feels secure/is empoweredEveryone is responsible for quality: understand both internal and external customer needs * Copyright © 2016 John Wiley & Sons, Inc. Respect for People cont’d The Role of Management:Responsible for culture of mutual trustServe as coaches & facilitatorsResponsible for developing workersProvide multi-functional trainingFacilitate teamworkSupport culture with appropriate incentive system including non-monetary
  • 16. * Copyright © 2016 John Wiley & Sons, Inc. Respect for People - cont’d Supplier RelationshipsSingle-source suppliers Can supply entire family of parts; external factoryBuild long-term relationships with small number of suppliersSuppliers locate near customerFewer contractsCost and information sharingWork together to certify processes * Copyright © 2016 John Wiley & Sons, Inc. Benefits of JIT Reduction in inventoriesImproved quality Reduced space requirementsShorter lead timesLower production costsIncreased productivityIncreased machine utilizationGreater flexibility * Copyright © 2016 John Wiley & Sons, Inc. Implementing JITStarts with a company shared vision of where it is and where it wants to goManagement needs to create the right atmosphereImplementation needs a designated “Champion” * Copyright © 2016 John Wiley & Sons, Inc. Implementing JIT – cont'd Implement the sequence of seven steps:
  • 17. Make quality improvements Reorganize workplace Reduce setup times Reduce lot sizes & lead times Implement layout changes Switch to pull production Develop relationship with suppliers * Copyright © 2016 John Wiley & Sons, Inc. JIT in Services Many JIT concepts also apply to Service companies Improved quality such as timeliness, service consistency, and courtesy Uniform facility loading to provide better service responsiveness Use of multifunction workers Reduction in cycle time Minimizing setup times and parallel processing Workplace organization * Copyright © 2016 John Wiley & Sons, Inc. JIT & Lean Systems: How it all Fits Together JIT: an overriding philosophy that affects all other business decisions Quality improvements (chs 5 & 6) Partnering with suppliers (ch 4) Changing job designs (ch 11) Facility layout (ch 10) Changes in production process (ch 3)
  • 18. Changes in inventory (ch 12) * Copyright © 2016 John Wiley & Sons, Inc. JIT Across the Organization JIT eliminates organizational barriers and improves communications Accounting changes or relies on activity-based costingMarketing by interfacing with the customersFinance approves and evaluates financial investmentsInformation systems create the network of information necessary for JIT to function * Copyright © 2016 John Wiley & Sons, Inc. Chapter 7 Highlights JIT is a philosophy that was developed by the Toyota Motor Company in the mid-1970s. It has become the standard for many industries by focusing on simplicity, eliminating waste, taking a broad view of operations, visibility, and flexibility. Three key elements of this philosophy are JIT manufacturing, total quality management, and respect for people. JIT views waste as anything that does not add value. * Copyright © 2016 John Wiley & Sons, Inc. Chapter 7 Highlights - cont’dTraditional manufacturing systems use “push” production; JIT uses “pull” production. Push systems anticipate future demand and produce in advance in
  • 19. order to have products in place when demand occurs. Pull systems work backwards. The last workstation in the production line requests the precise amounts of materials required. * Copyright © 2016 John Wiley & Sons, Inc. Chapter 7 Highlights - cont'dJIT manufacturing is a coordinated production system that enables the right quantities of parts to arrive when/where they are needed. Key elements of JIT manufacturing are the pull system and kanban production, small lot sizes and quick setups, uniform plant loading, flexible resources, and streamlined layout. * Copyright © 2016 John Wiley & Sons, Inc. Chapter 7 Highlights - cont'dTQM creates an organizational culture that defines quality as seen by the customer. The concepts of continuous improvement and quality at the source are integral to allowing for continual growth and the goal of identifying the causes of quality problems. * Copyright © 2016 John Wiley & Sons, Inc. Chapter 7 Highlights - cont'dJIT considers people to be the organization’s most important resource.JIT is equally applicable in service organizations, particularly with the push toward time- based competition and the need to cut costs.JIT success is dependent on inter-functional coordination and effort. *
  • 22. = = = = = = = Copyright © 2016 John Wiley & Sons, Inc. Chapter 6 - Statistical Quality Control (SQC) Operations Management 6th Edition R. Dan Reid & Nada R. Sanders * * Copyright © 2016 John Wiley & Sons, Inc. Copyright © 2016 John Wiley & Sons, Inc.
  • 23. Copyright © 2016 John Wiley & Sons, Inc. Learning ObjectivesDescribe categories of statistical quality control (SQC).Identify and describe causes of variation.Explain the use of descriptive statistics in measuring quality characteristics.Describe the use of control charts.Identify the differences between x-bar and R-charts. * Copyright © 2016 John Wiley & Sons, Inc. Learning Objectives - cont'dIdentify the differences between p- and c-charts.Explain the meaning of process capability and the process capability index.Explain the concept Six Sigma.Explain the process of acceptance sampling and describe the use of operating characteristic (OC) curves.Identify decisions that managers must make when implementing SPC.Describe the challenges inherent in measuring quality in service organizations. *
  • 24. Copyright © 2016 John Wiley & Sons, Inc. What is SQC? Statistical Quality Control (SQC) the term used to describe the set of statistical tools used by quality professionals to evaluate organizational quality. * Copyright © 2016 John Wiley & Sons, Inc. 3 Categories of SQC Statistical process control (SPC) inspecting a random sample of an output from process, within range and functioning properly Descriptive statistics the mean, standard deviation, and range Involve inspecting the output from a process Quality characteristics are measured and charted Helps identify in-process variations Acceptance sampling used to randomly inspect a batch of goods to determine acceptance/rejection Does not help to catch in-process problems *
  • 25. Copyright © 2016 John Wiley & Sons, Inc. Sources of VariationVariation exists in all processes.Variation can be categorized as either:Common or Random causes of variation, orRandom causes that we cannot identifyUnavoidable, i.e.; slight differences in process variables like diameter, weight, service time, temperatureAssignable causes of variationCauses can be identified Eliminate cause i.e.; poor employee training, worn tool, machine needing repair * Copyright © 2016 John Wiley & Sons, Inc. Descriptive Statistics The Mean- measure of central tendency The Range- difference between largest/smallest observations in a set of data Standard Deviation measures the amount of data dispersion around mean Distribution of Data shapeNormal or bell shaped orSkewed *
  • 26. Copyright © 2016 John Wiley & Sons, Inc. Distribution of Data Normal distributions Skewed distribution * Copyright © 2016 John Wiley & Sons, Inc. SPC Methods-Developing Control Charts Control Charts (aka process or QC charts) show sample data plotted on a graph with CL, UCL, and LCL Control chart for variables are used to monitor characteristics that can be measured, e.g. length, weight, diameter, time Control charts for attributes are used to monitor characteristics that have discrete values and can be counted, e.g. % defective, # of flaws in a shirt, etc. *
  • 27. Copyright © 2016 John Wiley & Sons, Inc. Setting Control Limits * * Copyright © 2016 John Wiley & Sons, Inc. Copyright © 2016 John Wiley & Sons, Inc. Control Charts for VariablesUse x-Bar and R-bar charts togetherUsed to monitor different variablesx-Bar and R-bar charts reveal different problemsWhat is the statistical control difference from one chart to the next? * Copyright © 2016 John Wiley & Sons, Inc. Control Charts for VariablesUse x-Bar charts to monitor the changes in the mean of a process (central tendencies)Use R-bar
  • 28. charts to monitor the dispersion or variability of the process System can show acceptable central tendencies but unacceptable variability System can show acceptable variability but unacceptable central tendencies * Copyright © 2016 John Wiley & Sons, Inc. Constructing an x-Bar Chart: A quality control inspector at the Cocoa Fizz soft drink company has taken three samples with four observations each of the volume of bottles filled. If the standard deviation of the bottling operation is .2 ounces, use the below data to develop control charts with limits of 3 standard deviations for the 16 oz. bottling operation. * Center line and control limit formulasTime 1Time 2Time 3Observation 115.816.116.0Observation 216.016.015.9Observation 315.815.815.9Observation 415.915.915.8Sample means (X-bar)15.87515.97515.9Sample ranges (R)0.20.30.2