Quality management assistance tool

1. Quality Management Assistance Tool
( Ishikawa diagram, Pareto Analysis, Poka -Yoke)
 Present by:
 Pravin Prajapati
 ( M.Tech - Production)
 150305208013

2. Seven Quality Tools
• Cause and Effect Diagram (Ishikawa Diagram)
• Flow Charts
• Check sheets
• Histograms
• Pareto Charts
• Control Charts
• Scatter Diagrams

3. Ishikawa diagram
 A common use of the Ishikawa diagram is in product design, to
identify desirable factors leading to an overall effect.
 It is known as a fishbone diagram because of its shape.
 Fishbone diagram (also known as Ishikawa diagram) was created
with the goal of identifying and grouping the causes which generate
a quality problem
 Fishbone diagram become a very useful instrument in risk
identification stage.

4. Ishikawa diagram
 Purpose: Graphical representation of
the trail leading to the root cause of a
problem
 How is it done?
 Decide which quality characteristic,
outcome or effect you want to
examine (may use Pareto chart)
 Backbone –draw straight line
 Ribs – categories
 Medium size bones –secondary
causes
 Small bones – root causes

5. Cause & Effect Diagrams Sample
Incorrect
shippi
ng
docu
ment
s
Manpower
Materials
Methods Machine
Environment
Keyboard sticks
Wrong source info
Wrong purchase order
Types
Source info incorrect
Dyslexic
Transposi
tion
Didn’t follow proc.
Poortraining
Glare on
d
i
s
p
l
a
y
Temp.
No
pr
o
c
e
d
ur
e
No communications
No training
Software problem
Corrupt
d
a
t
a

6. Pareto Chart
Purpose:
Prioritize problems.
 It is a type of chart that contains
both bars and a line graph, where
individual values are represented in
descending order by bars, and the
cumulative total is represented by
the line.
How is it done?
 Create a preliminary list of problem
classifications.
 Tally the occurrences in each problem
classification.
 Arrange each classification in order
from highest to lowest
 Construct the bar chart

7. Pareto Chart
Benefits:
 Pareto analysis helps graphically
display results so the significant
few problems emerge from the
general background
 It tells you what to work on first

8. Poka Yoke
 Poka-Yoke was developed by Shigeo Shingo from
Toyota Motors as a tool to achieve Zero Defects.
• The process of Zero Defects is also known as “Mistake
Proofing” or “Fail-Safe”.
• By taking over repetitive tasks or actions that depend on
vigilance or memory, Poka-Yoke can free workers’ time
and mind to pursue more value added activities.

9. Poka Yoke
 Every inspection method has weaknesses.
• Prevention of defects is better than detection.
• Poka-yoke devices can be applied within any process.
• Focus on the critical functions and actions.
• Sources of defects can be challenged and eliminated.

10. Poka Yoke
 Mistake-proofing systems
 Does not rely on operators
 catching mistakes
 Inexpensive Point of Origin
 inspection
 Quick feedback 100% of the time

11. Poka-Yoke Examples
Control (prevention):
The disc is only able to be inserted in one orientation.