7 QC Tools

What are the 7 QC Tools for Process Improvement?

➞ The 7 QC tools for process improvement is a systematic and scientific approach to Problem Solving Technique, It is used to solve 90% Problems of the shop floor.


1) What are The 7 QC Tools for Process Improvement?

 7 QC tools are the systematic and scientific approach of the Problem Solving Technique.
 It improves our workplace.
 Can be used to solve 90% of workplace problems.
 The 7 QC Tools for Process Improvement are Simple yet powerful.



2) From Where did the 7 QC Tools come?

 Primarily Kaoru Ishikawa introduced the 7 QC Tools.
 Ishikawa has known for the “Democratizing (Visual Aids/Symbols) Statistics”.
 Good visual aids make statistical and quality control more comprehensive.
 Dr. Kaoru Ishikawa was a professor of the engineering college at Tokyo University.


3) Why we use The 7 QC Tools for Process Improvement

The 7 QC tools for Process Improvement is a set of graphical techniques identified as being most helpful in troubleshooting issues related to quality.
→ The 7 QC tools are fundamental instruments to improve the process and product quality.
→ 7 QC tools are used to examine the production process, identify the key issues, control fluctuations of product quality, and give solutions to avoid future defects.
→ These are the tools which facilitate the organization to resolve the basic problems.
→ A most likely organization uses the basic 7 QC Tools for quality improvements of Product, Process or Service.
→ These 7 QC tools are easy to understand and implement and they do not need complex analytical/ statistical competence, hence the basic 7 QC tools are simple yet powerful.

4) 7 QC Tools:

  1. Flow Charts
  2. Cause and Effect Diagram (Fishbone diagram or Ishikawa Diagram) 
  3. Checksheet
  4. Histogram
  5. Pareto Chart
  6. Scatter Diagram
  7. Control Chart

➤ [1] 7 QC Tools Flow Charts:

→“Flowchart is a diagrammatic representation that illustrates the sequence of operation to be performed to get the desired result.”
→ A flowchart is a tool of the 7 QC Tools for Process Improvement.
 A flow chart is a visual representation tool for a process, therefore, the process easily illustrates the Internal and external operational boundaries.


7 QC Tools

→ “A diagram which represents a meaningful relationship between an effect and its causes are called the Cause & Effect Diagram."
→ Another name of Cause and effect diagram is a Fishbone Diagram or Ishikawa Diagram.
Cause and Effect Diagram (Fishbone diagram or Ishikawa Diagram) is a part of the 7 QC Tools for Process Improvement.
 It guides concrete action and tracks the potential causes during an investigation the effort to determine whether the item significantly contributes to the problem or not.


7 QC Tools

➤ [3] 7 QC Tools Check Sheet :

→ "Check Sheet is a structured, prepared form for collecting and analyzing data." 
→ The purpose of a checklist is to summarize the data and a tally count of event occurrences.
→ A check sheet counts the number of occurrences of an event, such as defects or non-conformance.
→ Hence the Check Sheet is a "tally sheet " of the 7 QC Tools for Process Improvement.
→ In many cases, a checklist will summarize countable data related to certain types of defects and will provide a rough graphical representation of wherein a part of the process, defects occurred.
7 QC Tools



➤ [4] 7 QC Tools  Histogram :

→ “Histogram is a type of bar chart representing the frequency distribution of the data from a process.” 
→ The histogram is the best Frequency distribution tool of the 7 QC Tools for Process Improvement.
→ A histogram is a pictorial representation of a set of data.


7 QC Tools

➤ [5] 7 QC Tools Pareto Chart :

→ "Pareto chart is a bar graph arranged in descending order of height from left to right”
→ “Pareto chart is a diagram that shows the order of the largest number of occurrences by item or by classes and the cumulative sum total.”
→ Pareto Chart communicates the principle of 80:20, therefore the Pareto Chart is an 80:20 analysis chart.
→ The Pareto Chart also gives us information about Vital few from Trivial many, Hence, Pareto chart is "Vital few from Trivial many tools" of the 7 QC tools for Process Improvement.
→ It states that 80% of an effect comes from 20% of the causes.


7 QC Tools

➤ [6] 7 QC Tools Scatter Diagram:

→ “Scatter Diagram is used to study and identify the possible relationship between two variables”.
→ Scatter diagram is the best validation tool of 7 QC Tools.


7 QC Tools



➤ [7] 7 QC Tools Control Chart:

→ “Control chart is a type of run chart used for studying the process variation over time." 
→ Most importantly, the control chart is a time series plot that is used to monitor a process over time.
→ It is a plot of a process characteristic, usually through time with statistically determined limits.
→ When used for process monitoring, it helps the user to determine the appropriate type of action to take on the process depending on a degree of variation in the process.
→ With comparing above all tool Control Chart is the best process forecasting tool of the 7 QC Tools for Process Improvement.


7 QC Tools


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See Also: Content 7 QC Tools
2. Flow Charts - 7 QC Tools
4. Check Sheet - 7 QC Tools
5. Histogram - 7 QC Tools
6. Pareto Chart - 7 QC Tools
7. Scatter Diagram - 7 QC Tools
8. Control Chart - 7 QC Tools