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Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458.
All rights reserved
Quality Control
TQM-Tools and
Techniques
(Applications)
Asst. Prof. Dr. Mahmoud Abbas Mahmoud
2014 - 2015
Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458.
All rights reserved
The Pareto Chart is a simple to use and
powerful graphic to identify where the
majority of problems in a process are
originating.
Pareto Chart
Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458.
All rights reserved
Steps:
1. Determine the method of classifying the
data: by problem, cause, type of
nonconformity, etc
2. Decide if dollars (best), weighted frequency,
or frequency is to be used to rank the
characteristics
3. Collect data for an appropriate time interval
Constructing a Pareto Diagram
Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458.
All rights reserved
Steps cont’d:
4. Summarize the data and rank order
categories from largest to smallest
5. Compute the cumulative percentage if it is
to be used
6. Construct the diagram and find the vital few
Constructing a Pareto Diagram
Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458.
All rights reserved
The count of paint defects from an
automotive assembly plant are as in table
below ;
Use Pareto diagram to analyze these data!
Case 1
OtherOrange
peal
Thin
paint
Sealer
under
Off-
color
SagDirt in
paint
ScratchDefect
11254221652Count
Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458.
All rights reserved
Pareto Diagram for Case 1
Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458.
All rights reserved
Case 2
The count of defects found in refrigerators
tested by production line inspectors are as in
table below :
Use Pareto diagram to analyze these data!
OtherCompress
or (noise)
Paint
scratch
Water
line screw
loose
Shelf trim
loose
Handel trim
loose
Door not
aligned
Defect
78453211157158Count
Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458.
All rights reserved
Cause-and-Effect Diagram
Cause-and-Effect Diagram
C
a
u
s
e
s
E
f
f
e
c
t
Quality
Characteristic
People Materials
Equipment Measurement
Work Methods
Environment
Primary
Cause
Secondary Cause
Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458.
All rights reserved
Cause-and-Effect Diagram Case 1
Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458.
All rights reserved
Cause-and-Effect Diagram Case 1
Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458.
All rights reserved
Construct a cause and effect diagram
for the case of computer downtime !!!
Cause-and-Effect Diagram Case 2
Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458.
All rights reserved
Cause-and-Effect Diagram

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Applications dr. mahmoud al-naimi

  • 1. Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458. All rights reserved Quality Control TQM-Tools and Techniques (Applications) Asst. Prof. Dr. Mahmoud Abbas Mahmoud 2014 - 2015
  • 2. Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458. All rights reserved The Pareto Chart is a simple to use and powerful graphic to identify where the majority of problems in a process are originating. Pareto Chart
  • 3. Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458. All rights reserved Steps: 1. Determine the method of classifying the data: by problem, cause, type of nonconformity, etc 2. Decide if dollars (best), weighted frequency, or frequency is to be used to rank the characteristics 3. Collect data for an appropriate time interval Constructing a Pareto Diagram
  • 4. Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458. All rights reserved Steps cont’d: 4. Summarize the data and rank order categories from largest to smallest 5. Compute the cumulative percentage if it is to be used 6. Construct the diagram and find the vital few Constructing a Pareto Diagram
  • 5. Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458. All rights reserved The count of paint defects from an automotive assembly plant are as in table below ; Use Pareto diagram to analyze these data! Case 1 OtherOrange peal Thin paint Sealer under Off- color SagDirt in paint ScratchDefect 11254221652Count
  • 6. Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458. All rights reserved Pareto Diagram for Case 1
  • 7. Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458. All rights reserved Case 2 The count of defects found in refrigerators tested by production line inspectors are as in table below : Use Pareto diagram to analyze these data! OtherCompress or (noise) Paint scratch Water line screw loose Shelf trim loose Handel trim loose Door not aligned Defect 78453211157158Count
  • 8. Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458. All rights reserved Cause-and-Effect Diagram Cause-and-Effect Diagram C a u s e s E f f e c t Quality Characteristic People Materials Equipment Measurement Work Methods Environment Primary Cause Secondary Cause
  • 9. Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458. All rights reserved Cause-and-Effect Diagram Case 1
  • 10. Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458. All rights reserved Cause-and-Effect Diagram Case 1
  • 11. Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458. All rights reserved Construct a cause and effect diagram for the case of computer downtime !!! Cause-and-Effect Diagram Case 2
  • 12. Besterfield: Quality Control, 8th ed.. © 2009 Pearson Education, Upper Saddle River, NJ 07458. All rights reserved Cause-and-Effect Diagram