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Control Charts
Group Members:-
Sneha Dasouni (201810702110034)
Sonali Sharma (201810702110035)
Shikhar Mehrotra (201810702110036)
Abhay Agrahari (201810702110037
Course:- BBA
Year/ Semester:- 2nd / 3rd
Subject:- Operations Management
INDEX
• What is a Control Chart ?
• What do these charts do ?
• Its advantages and purposes.
• Types of Control Charts.
• Comparison of Variable and Attribute Charts.
1
What is a Control Chart ?
• Graphical representation of
the collected information.
• Pertains to the measured
quality characteristics.
• Graph used to study how a
process changes over time.
• Data are plotted in time order.
2
What do these Charts Do ?
• Detects variations in the
production process .
• Warns if there is any deviation
from the specified tolerance
limits.
• Primarily a diagnostic technique.
• Depicts if there is any change on
the characteristics of items since
the start of the production.
3
Advantages of Control Charts
• It indicates whether a process
is in control or out of control.
• It ensures product quality
level.
• It warns rectification in time
and scrap percentage can be
reduced.
• It provides information about
the selection of process.
4
Types of Control Charts 5
Variable Charts
• Used to evaluate variation in a
process where the measurement is
a variable.
• Variable measurement means
the variable can be measured on a
continuous scale (e.g. height,
weight, length, concentration).
• The two main types of variable
charts are:- (i) X- bar (ii) R- bar
6
7
Attribute Charts
• Used to evaluate variation where the
measurement is an attribute.
• These charts come into picture where
the colour , number of spots etc. are to
be considered.
• There are two types of Attribute
charts:-
(i) Binomial distribution (e.g. p, np-
chart)
8
9
Variable and Attribute Charts
(Comparison)
• Variable charts involve the measurement of the job dimensions
whereas an attribute chart only differentiates between a
defective item and a non-defective item.
• Variable charts are more detailed and contain more information
as compared to attribute charts.
• Attribute charts is based on ‘GO and NO GO’ data but variable
chart also rectifies the problem.
• Variables charts are expensive in comparison to attribute
charts.
10
Control charts ppt

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Control charts ppt

  • 1. Control Charts Group Members:- Sneha Dasouni (201810702110034) Sonali Sharma (201810702110035) Shikhar Mehrotra (201810702110036) Abhay Agrahari (201810702110037 Course:- BBA Year/ Semester:- 2nd / 3rd Subject:- Operations Management
  • 2. INDEX • What is a Control Chart ? • What do these charts do ? • Its advantages and purposes. • Types of Control Charts. • Comparison of Variable and Attribute Charts. 1
  • 3. What is a Control Chart ? • Graphical representation of the collected information. • Pertains to the measured quality characteristics. • Graph used to study how a process changes over time. • Data are plotted in time order. 2
  • 4. What do these Charts Do ? • Detects variations in the production process . • Warns if there is any deviation from the specified tolerance limits. • Primarily a diagnostic technique. • Depicts if there is any change on the characteristics of items since the start of the production. 3
  • 5. Advantages of Control Charts • It indicates whether a process is in control or out of control. • It ensures product quality level. • It warns rectification in time and scrap percentage can be reduced. • It provides information about the selection of process. 4
  • 6. Types of Control Charts 5
  • 7. Variable Charts • Used to evaluate variation in a process where the measurement is a variable. • Variable measurement means the variable can be measured on a continuous scale (e.g. height, weight, length, concentration). • The two main types of variable charts are:- (i) X- bar (ii) R- bar 6
  • 8. 7
  • 9. Attribute Charts • Used to evaluate variation where the measurement is an attribute. • These charts come into picture where the colour , number of spots etc. are to be considered. • There are two types of Attribute charts:- (i) Binomial distribution (e.g. p, np- chart) 8
  • 10. 9
  • 11. Variable and Attribute Charts (Comparison) • Variable charts involve the measurement of the job dimensions whereas an attribute chart only differentiates between a defective item and a non-defective item. • Variable charts are more detailed and contain more information as compared to attribute charts. • Attribute charts is based on ‘GO and NO GO’ data but variable chart also rectifies the problem. • Variables charts are expensive in comparison to attribute charts. 10