7 qc tools

7 QC TOOLS

1. are the best Quality Control Tools Which helps in Solving quality issues through Data collection Analysing data Identification of Root Cause Measuring results 7 QC TOOLS By GAURAV KUMAR

2. “ 95% quality related problems at workplace can be solved with the help of 7 QC Tools” …Prof. Kaoru Ishikawa

3. 7 QC TOOLS ARE Check sheet Cause-and-effect diagram ( fishbone or Ishikawa diagram ) Flow chart ( Stratification ) Pareto chart/analysis Control chart Scatter diagram Histogram

4. 1.Check Sheet A Check Sheet is a simple document that is used for collecting data in real time and at the location where data is generated.

5. Purpose How often are certain events happening Making information collection easy from data (Format).

6. 2. Cause and Effect Diagram (Ishikawa) Barnstorming and root cause finding technique It shows the relationship of all factors (cause) that lead to the given situation (effect). It identifies major causes and breaks them down into sub-causes and further sub divisions

7. Purpose Identifies various cause affecting a process Help group in reaching a common understanding of problem

8. 3. Process Flow Chart (Stratification) Bird’s eye view of the actual process A Flow Chart is a type of diagram that represents a process step by step with the help of various kind of box shapes and connecting these with arrows. Gives an idea, about conversion of input into output Identify the value added and non – value added activities

9. Purpose It gives a visual representation of process Identify the Steps and Material needed for the process. Help in quickly analysing the process

10. 4. Pareto Analysis Combination of bar chart and line graph A bar chart that helps to prioritize action by arranging elements in descending order of occurrence. Bar chart presents the actual data in descending order Line graph presents cumulative data in ascending order Based on 80-20 rule

11. Purpose Sort out the “vital few” from the “trivial many” Separates important from non-important causes contributing to a problem

12. 5. Control Chart A control chart is a line graph used to display variation on time ordered interval in process. A centreline and control limits are placed on the graphs to help analyse the pattern of data Maintain the process variation within control limits

13. Purpose Control chart indicates whether a process is in control or not It ensures product quality level To identify the dynamic or special causes of variation in a repeating process

14. 6. Scatter Diagram Scatter diagram is a tool used to study the possible relationship between two variables. One is independent on X axis Other is dependent on Y-axis Forecast the future trend on the basis of current relationship b/w two variables

15. Purpose Diagram makes it clear whether a relationship exists and shows the strength of that relationship. If data are scattered very close to trend, it show strong relationship otherwise it is weak relationship.

16. 7. Histogram A Histogram displays the variation with the process, also called a frequency distribution Vertical rectangular bars showcase the frequency of data Present the large amount of data

17. Purpose To show the Frequency distribution of set of measurements. Allows one to quickly visualize what is going on within a large amount of data.

18. In conclusion PFC gives the bird eye view of the actual process and helps in finding the troubles spots in the process CS confirms the physical presence of the defects and defectives H showcase the large amount of the data in graphical format PC prioritizes the vital few instead of trivial many issues C and E diagram helps in finding the possible causes for a problem SC confirms the relationships b/w two variables CC signifies the process variation and give warning when data go beyond control limits