The document describes a book about 7 quality control tools. It includes an introduction to each of the 7 tools: process flow diagram, check sheet, histogram, Pareto diagram, cause-and-effect diagram, scatter diagram, and control charts. For each tool it provides details on what it is, how to construct it, examples, and how to construct the tool in Microsoft Excel. It also includes an introduction to Kaizen and 5S, practice problems, a test, and answers.
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Salient features of the Book
The workshop is specially designed and prepared
for senior, middle and junior level quality
professionals, engineers, managers of
manufacturing and service industries.
Graphics in the workshop elucidates the text and
help to better understand the tools.
Excel Images for Histogram, Pareto Analysis, Scatter
diagram and Control charts are given with excel
commands. This helps the learner to work easy in
excel while construction the tools.
Illustrative worked examples with manual
calculation for better understanding.
Data based practical problems for self practice.
Project work based on 7QC Tools.
Test paper with Multiple Choice Questions to check
learning.
Introduction of Kaizen and 5-S.
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About Author
Narender Sharma
Lean Six Sigma practitioner, coach and consultant Quality Excellence
Having 20 years of cross industry experience including 13years strong working experience as a Quality Professional in “In-
process Inspection” in a leading container glass manufacturing company “Hindusthan National Glass & Industries Ltd.”
(HNG) from 2001 to 2014
Earned the degrees of MBA (Production and Operation Management), B.Sc. (Electronics), and B.Ed.
I have tried to put my all experience and knowledge gained from my work and study area.
“It is very difficult to make things easy to understand by others and I sincerely do this by designing graphics in this book. If you
still find difficult to understand these tools, definitely I need to work more hard to make things easier. The book contains not
only the theoretical concept of all 7 QC tools but the practical application with illustrative worked examples and construction of
tools like Histogram, Pareto Chart, Scatter diagram, Control charts in MS Excel with help of commands and images also.”
…………………..Narender Sharma
Connect
Website: www.shakehandwithlife.in
Blog: www.blog.shakehandwithlife.in
Email: shakehandwithlife@gmail.com
YouTube/Linkedin/Facebook/Telegram @ShakehandwithLife
Twitter/Instagram @Sharma_ndr
Narender Sharma
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Click on Contents
Introduction ......................................................................................................................................................................................................................................1
Tool No. 1 – Process Flow Diagram ................................................................................................................................................................................................. 2
What is Process Flow Diagram?....................................................................................................................................................................................................................................................................2
Application and uses of Process Flow Diagram......................................................................................................................................................................................................................................3
Value Added Steps.......................................................................................................................................................................................................................................... 3
Non- Value Added Steps................................................................................................................................................................................................................................. 3
Construction of Process Flow Diagram......................................................................................................................................................................................................................................................5
Illustrative Work Examples.............................................................................................................................................................................................................................................................................6
Measuring Cycle Time .................................................................................................................................................................................................................................................................................... 11
Process Efficiency............................................................................................................................................................................................................................................................................................. 11
Tool No. 2 – Check Sheet ................................................................................................................................................................................................................12
What is Check Sheet? ...................................................................................................................................................................................................................................................................................... 12
Application and uses of Check Sheet........................................................................................................................................................................................................................................................ 12
Construction of Check Sheet........................................................................................................................................................................................................................................................................ 12
Illustrative Worked Examples..................................................................................................................................................................................................................................................................... 13
Tool No. 3 – Histogram...................................................................................................................................................................................................................15
What is Histogram? ......................................................................................................................................................................................................................................................................................... 15
Histogram Shapes......................................................................................................................................................................................................................................... 15
Application and uses of Histogram........................................................................................................................................................................................................................................................... 16
Construction of Histogram ........................................................................................................................................................................................................................................................................... 16
Histogram For Ungrouped Data ................................................................................................................................................................................................................... 16
Histogram for Grouped data ........................................................................................................................................................................................................................ 17
Illustrative Worked Examples..................................................................................................................................................................................................................................................................... 18
Construction of Histogram in Excel .......................................................................................................................................................................................................................................................... 20
Tool No. 4 – Pareto Diagram......................................................................................................................................................................................................... 22
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What is Pareto Diagram?............................................................................................................................................................................................................................................................................... 22
Who was Pareto? ......................................................................................................................................................................................................................................... 22
ABC Analysis. ................................................................................................................................................................................................................................................ 23
80 – 20 Rule.................................................................................................................................................................................................................................................. 23
Application and uses of Pareto Diagram...................................................................................................................................................................................................... 23
Manual Construction of Pareto Chart....................................................................................................................................................................................................................................................... 24
Construction of Pareto Chart in Excel...................................................................................................................................................................................................................................................... 25
Illustrative Worked Example....................................................................................................................................................................................................................................................................... 28
Tool No. 5 – Cause and Effect Diagram .........................................................................................................................................................................................29
What is Cause and Effect diagram?........................................................................................................................................................................................................................................................... 29
Application and uses of C&E Diagram ..................................................................................................................................................................................................................................................... 30
Construction of Cause and Effect Diagram ............................................................................................................................................................................................................................................ 31
Brainstorming............................................................................................................................................................................................................................................... 31
Essentials for organizing Brainstorming sessions to get more accurate and usable result ......................................................................................................................... 31
Illustrative Worked Example....................................................................................................................................................................................................................................................................... 32
Tool No. 6 Scatter Diagram............................................................................................................................................................................................................ 34
What is Scatter Diagram?.............................................................................................................................................................................................................................................................................. 34
Application and uses of scatter diagram................................................................................................................................................................................................................................................. 34
Interpretation of Different Patterns of Scatter Diagram.................................................................................................................................................................................................................. 35
Algebraic value of relationship between two variables (X and Y) i.e. Correlation Coefficient ........................................................................................................................................ 37
Karl Pearson’s Coefficient of Correlation (r). ....................................................................................................................................................................................................................................... 37
Interpretation of value of 'r'......................................................................................................................................................................................................................... 38
Construction of Scatter diagram............................................................................................................................................................................................................................................................... 39
Illustrative Worked Examples..................................................................................................................................................................................................................................................................... 40
Construction of Scatter Diagram in Excel............................................................................................................................................................................................................................................... 42
Calculation of Coefficient of Correlation (r) ................................................................................................................................................................................................. 44
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Tool No. 7 Control Chart ................................................................................................................................................................................................................ 45
What is Control Chart?................................................................................................................................................................................................................................................................................... 45
Types of Charts............................................................................................................................................................................................................................................. 46
Mean Charts ................................................................................................................................................................................................................................................. 46
Run Charts .................................................................................................................................................................................................................................................... 46
Accuracy and Precision.................................................................................................................................................................................................................................................................................. 47
Archer’s Bow and Target analogy for understanding accuracy and precision............................................................................................................................................. 48
Application and uses of Control Charts................................................................................................................................................................................................................................................... 49
Continuous Use of Control Charts, Showing Improved Quality .................................................................................................................................................................................................... 50
Construction of Control Charts................................................................................................................................................................................................................................................................... 51
Steps of Construction of Mean Chart........................................................................................................................................................................................................... 51
Steps of construction of Run/Range charts.................................................................................................................................................................................................. 52
Illustrative Worked Example....................................................................................................................................................................................................................................................................... 53
Construction of Control Chart in Excel.................................................................................................................................................................................................................................................... 57
Mean Chart................................................................................................................................................................................................................................................... 58
Range Chart ................................................................................................................................................................................................................................................. 60
Problems for Practice .....................................................................................................................................................................................................................62
Project work : Reduce monthly electricity bill by 50% using 7qc tools..........................................................................................................................................64
Test Paper.......................................................................................................................................................................................................................................66
Answer Key..................................................................................................................................................................................................................................... 72
Result.............................................................................................................................................................................................................................................. 73
Introduction of Kaizen ................................................................................................................................................................................................................... 74
What is Kaizen?................................................................................................................................................................................................................................................................................................. 74
Foundation for Kaizen:................................................................................................................................................................................................................................................................................... 74
Kaizen Strategy.................................................................................................................................................................................................................................................................................................. 75
Kaizen Practices................................................................................................................................................................................................................................................................................................ 76
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Introduction of 5 S.......................................................................................................................................................................................................................... 77
What is 5S?.......................................................................................................................................................................................................................................................................................................... 77
Why does 5S practice useful?...................................................................................................................................................................................................................................................................... 78
How to implement 5S?.................................................................................................................................................................................................................................................................................. 78
References ...................................................................................................................................................................................................................................... 79
Feedback......................................................................................................................................................................................................................................... 79
9. 7QC Tools : Introduction
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Introduction
Fundamental Tools to solve 95% quality related problems
These seven effective methods or tools which will offer any organization means of collecting, presenting, and analyzing most
of its data problems. 95% of quality related problems in the factory can be solved with these 7 fundamental quality tools.
Developed by
The Seven QC tools were developed by Prof. Kaoru Ishikawa, ‘The father of QCCs’ (Quality Control Circle). Through his
experience, he identifies a set of tools which can be used by teams and individuals to interpret the data fully and derive the
maximum information out from it.
Can be used by
Business owners, Junior, Middle and Senior level quality professionals, Engineers, Managers in different kind of
manufacturing and service industries, Sports, Research.
Applied in
Production ,Quality Control, Warehouse , Sales and Purchase, Personnel Management, Storekeeping, Marketing , Service delivery, Housekeeping, Accounting,
Banking , Airline, Insurance, Telecommunication, Medical and healthcare, Education and so on…….
Applied by an individual or team in
Process Audit, Data Collection and Analysis, Data presentation, Identifying Critical Issues, Identification of root causes, Brain Storming, Quality control , Process
Control, Problem solving , Decision Making, Continual Improvement , Maintaining Accuracy and Precision, Kaizen Activities, Six Sigma projects, Cost reduction
Business Research etc….
Getting expertise in various skills while using 7QC Tools
Control over the process, Finding value added and Non value added activities, Reducing cycle time, Learning of data collection techniques, Smart presentation of
data, Tracking the most appropriate cause for a problem, Dig out the root cause for a problem, Calculation of degree of relation between cause and effect of a
problem, Accuracy of results, data analytic skills, Comparing past and future trends of data with present, Learning statistics process control, MS-Excel.
10. 7QC Tools : Process Flow Diagram
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Tool No. 1 – Process Flow Diagram
What is Process Flow Diagram?
Process flow diagram is a symbolic representation of all steps of whole process through which any product or service move.
All steps of process shown diagrammatically in a sequential manner. Process flow diagram can easily be seen nearby the actual process in the organization.
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Application and uses of Process Flow Diagram
It uses to clearly define and analyzing the processes.
Step by Step picture of the process use for the purpose of analysis, discussion or communication.
It uses for standardization of the process.
It uses for locating the areas of improvement in the process.
It uses for the purpose of training and development of new employees before working on actual process.
Process flow diagram improve the efficiency of process
The diagram makes it easy to visualize the entire system, identify potential trouble spots, and locate control activities.
It answers the question, “Who/What is next?”
Improvements can be accomplished by changing, reducing, combining or eliminating steps.
It helps to finding NVA ( Non Valuable Activities) tasks and their elimination.
It helps to avoid the duplication of the work.
Its helps to avoid unnecessary activities.
Total cycle time and time per activity can be calculated with help of process flow diagram.
Idle time between two steps or throughout the process can be calculated and eliminated.
To elude repetition of work.
Value Added Steps
Customers are willing to pay for it
It physically changes the product
It’s done right the first time
Example value added activities; Entering order, ordering materials preparing drawing, Assembling, Mandatory testing, packaging, Shipping to customer.
Non- Value Added Steps
Not essential to produce output
Does not add value to the output.
Example activities : Waiting, Storing , Staging, Counting, Inspecting, Recording, Obtaining approvals, Testing, Reviewing, Copying, Filing, Reworking,
Tracking
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Symbols use to make process flow diagram are
Rounded Rectangle uses for Start or Terminate the process
Rectangle like symbol uses for an operation. Any kind of activity on product is comes under
operation. It indicates main steps in a process, method or procedure. Usually the part , material ,
or product concerned is modified or changed during operation, e.g. In a garment industry the
cloth passes under different kind of operation like stitching, washing, folding, press,
embroidery, making border etc. similarly in an Insurance industry to do an Insurance policy of a
customer different kind of operation are collecting data of the customer, filling the form,
printing the form, dispatch the form, collection of payments etc.
Diamond like symbol uses for decision or any condition like “yes or no, OK or Not OK”. If the
condition satisfied or the decision is ‘yes’ then process move with arrow coming out in forward
direction otherwise follow the arrow coming our left or right
An arrow like symbol uses for the purpose of sequence flow of the process. It connect each step
and helps to read the Flow Chart.
‘D’ like symbol uses for the ‘Delay’. This show the temporary hold for any correction or wait.
Inverted Triangle uses for the storage of the product. When product do not go for any further
operation or the product has passed all the stages of process then product needs to be stored at
some specific place then this stage of the process will be shown by the inverted triangle in the
process diagram.
Note :
There are many other symbols use to make process flow diagram. But most of time only these symbols shown above are use .
Some time Round shape is used for operation instead of Rectangle. This is because there is no standard rule for using symbols to make process flow
diagram. Different organization and different department using symbols according to there technical areas. Some time they make there own symbols. But
still the basic rule of process flow diagram is same and very much necessary to learn by all quality professionals.
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Construction of Process Flow Diagram
Steps of construction of process flow diagram.
1. Make the team of those persons related to the process.
2. Fix the Start and End point to create the boundaries of the process.
Where does the process begin?
Where does the process terminate?
3. Write down all the steps of the process
separately.
Write down Activities, Decision points or
conditions, store or delay points.
Write the connecting sequences of all steps
explaining the process flow.
4. Select proper symbol for each step of the process.
5. Put all the symbols at one place.
6. Connect all the symbols by arrows in a proper
sequence flow.
7. No. the steps of process and time elapse in each
step to calculate cycle time.
8. Write mandatory Heading on the process flow
diagram.
Task
Starting point of the diagram
Terminating point of the diagram
Process diagram made by
Date of Charting/Making
9. Finalize the process diagram
Confirm the process is actually working in the same way as designed.
People related to the process are following the process as charted.
Make a consensus among all members on designed process diagram.
If any logical suggestion then remove the extra step and add if any step is missing.
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Illustrative Work Examples
Example 1. Prepare Process flow diagram of Tea Making in kitchen.
Title/ Task :Tea Making in Kitchen Starting Point : Ignite the Burner End Point: Close the Burner
Process Diagram Made by : Narender Sharma Date of Charting :
Summary
Event Sequence Flow
Frequency 2 10 1 15
Start/End Activity
Decision
n
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Example . 2 Prepare Process Flow Diagram of a “Customer Check Out Process in a General Store”.
Title/ Task : Customer Check Out Process in a General Store Starting Point : Greet Customer End Point: Thanks Customer
Process Diagram Made by : Narender Sharma Date of Charting :
Summary
Event Sequence Flow
Frequency 2 7 2 12
Start/End Activity
Decision
n
No
Yes
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