The document discusses the 7 main quality control tools used for collecting and analyzing numerical data. The tools are: Pareto diagram, check sheet, stratification, cause and effect diagram, scatter diagram, histogram, and control chart/graph. Each tool is explained briefly. The Pareto diagram identifies important issues. Stratification involves basic data processing. The scatter diagram shows relationships between two variables. The cause and effect diagram identifies causes and their effects. The histogram depicts data distribution. The check sheet records collected data. And the control chart finds abnormalities and status. Together these 7 QC tools are used to collect, analyze, identify root causes, and measure results.

1. 7 QC Tools
From
Gurmeet Singh
Mehta Engineer Limited
D-118-119,Phase 5,
Focal point,
Ludhiana
Training on

2. What are 7 QC Tools ?
QC tools are the means for Collecting data , analyzing data ,
identifying root causes and measuring the results.
THESE TOOLS ARE RELATED TO Numerical DATA processing
USER HAS TO DEVELOP THE SOLUTION &
IMPLEMENT

3. • Pareto Diagram
•Check Sheet
• Stratification
•Cause and Effect Diagram
•Scatter Diagram
•Histogram
•Control Chart/Graph
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4. Pareto Diagram
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5. Pareto Diagram
1. What is Pareto diagram ?
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6. Pareto Diagram
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7. Pareto Diagram
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8. Pareto Diagram
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Check sheet

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Checksheet

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Checksheet

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Checksheet

13. Stratification
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14. Stratification
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Stratification

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Stratification

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Cause and Effect Diagram

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Cause & Effect Diagram
1. What is Cause & effect Diagram ?
A cause and effect diagram is “a fish-bone diagram that presents a
systematic representation of the relationship between the effect (result)
and affecting factors (causes).”
Solving a problem in a scientific manner requires clarification of a cause
and effect relationship, where the effect (e.g., the result of work) varies
according to factors (e.g., facilities and machines used, method of work,
workers, and materials and parts used). To obtain a good work result, we
must identify the effects of various factors and develop measures to
improve the result accordingly.

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Cause & Effect Diagram
Can obtain a clear
overall picture of causal
relation. (A change in
the cause triggers a
variation in the
result.)○ Can clarify
the cause and effect
relationship.
Can list up all causes
to identify important
causes.
Can determine the
direction of action
(countermeasure).
Method Usage Result
Used when
clarifying a cause
and effect
relationship.[Used
during a phase to
analyze causes.]
 Used to develop
countermeasures.
[Used during a phase to plan
countermeasures.]
Material Method
ManMachine
Cause (4M’s) Result
(Controlled State)
Effect
Cause and EffectCause and Effect
DiagramDiagram
Material Method
ManMachine
Cause (4M’s) Result
(Controlled State)
Effect
Cause and EffectCause and Effect
DiagramDiagram

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Cause & Effect Diagram

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Scatter Diagram

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ScatterDiagram

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Histogram

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Histogram

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Histogram

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Histogram

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Controlchart

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Controlchart

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Controlchart

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Controlchart

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Controlchart

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Controlchart

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Controlchart

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Controlchart

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Controlchart

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Controlchart

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Controlchart

38. • Pareto Diagram To identify the current status and issues
• Stratification Basic processing performed when collecting data
• Scatter Diagram To identify the relationship between two things
• Cause and Effect Diagram To identify the cause and effect relationship
• Histogram To see the distribution of data
• Check Sheet To record data collection
• Control Chart/Graph To find out abnormalities and identify the
current status
To sum up 7 QC tools (Numerical data ) are used as follow:
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Thank you
From
Gurmeet Singh
Mehta Engineer Limited
D-118-119,Phase 5,
Focal point,
Ludhiana