Seven Tools QC

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Tools of Quality

Control

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Tools of Quality

Control

Emani Sarathy

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Coverage

The Seven Statistical Quality Control Tools

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The Seven

Statistical

QualityControl

Tools

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Q7 Tools

These 7 tools help Quality ControlCircles to do Brain Storming

Check Sheets

Pareto Charts

Cause-Effect Diagrams

Histograms

Run Chart

Scatter Diagrams

Control Charts

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Brain Storming

PurposeTo tap mental resources of an entire group

Useful for

- Problem identification- Data identification for collection

- Identification of causes in cause-effect

diagram

- Generating potential solution

- Identify problems of implementation

of solutions

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Q1 Check Sheets A data collection form consisting of multiple

categories Each category has an operational

definition and can be checked off as it occurs.

Helps summarizing the dataErrorType

Mth1 Mth2 Mth3 Mth4 Mth5 Total

1 6

2 2

3 8

Total 3 7 2 4 16

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Q2 Pareto Charts A bar chart presentation to prioritize all actions

identified for continuous improvement. Based on the

80-20 rule (80% problems are caused by 20%

causes)

1 2 3 Other

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Q3 Cause Effect Diagram

Also known as Fish-Bone Diagram or

Ishikawa Diagram.

A graphic tool used to explore and displayall the factors that may influence or cause

a given outcome

To analyze systematically root causes ofa problem (effect). Effect is the quality

problem under investigation.

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Q3 Cause Effect Diagram

(Contd.)

Environment Methods

Man Machine Material

EFFECT(Problem)

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Q3 Cause Effect Diagram

(Contd.)

Causes under the main headings viz:

Man, Machine, Methods, Material and

Environment is brainstormed usingWhy? ....

Questioning (Why ?) is done till all

possible causes/ subcauses areidentified and listed

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Q4 Histograms

To arrange and display data in an

order so that variation can be seen

Similar to Check Sheet, drawn withbars

Shows frequencies of occurrence of

a set of values (hence called afrequency distribution)

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Q4 Histograms (Contd.)

Pictorial representation of variance

1-2 2-3 3-4 4-5 5-6 6-7 7-

8

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Q5 Run Charts

A display of the data in the order that they

occur.

Displays process variation and can be used

to indicate special causes of processvariation in the form of trends, shifts or

other non-random patterns

X

Parameter Vs. Time

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Q6 Scatter Diagrams

To Identify dependent and

independent

parameters.Parameter 1

Parameter 2

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Q7 Control Sheets

To monitor a process and to identify

common causes and special causes

UCL

LCL

X

Parameter Vs. Time

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Thank You