implementation of quality tools in small medium industry - Universiti ...

7250Pareto chart of ComplaintsCounts200150100100806040Percent50200Conplaints room appliances cleanliness comfort OtherCounts 100 50 50 15 7Percent 45.0 22.5 22.5 6.8 3.2Cum % 45.0 67.6 90.1 96.8 100.00Figure 2.2.Typically the left y-axis is frequency of occurrence, and the right y-axis isthe cumulative percentage of the total number of occurrences.The x-axis displays the categories of defects, complaints, waste, etc.2.2.2.1 Weighted Pareto ChartA weighted Pareto chart not only considers the frequency of occurrence, butthe importance as well. A weighted Pareto chart can account for the severity of thedefects, or the cost, or anything else you would like to track. For example, supposeyou have 5 coating defects that you are tracking: wrinkles, stains, scratches, dirtspecs, and bubbles.Collect data on the frequency of defect occurrence and the cost to rework. Aweighted Pareto chart may change your priority for improvement projects byconsidering data based on both cost and frequency data. For example, even thoughwrinkles may be more frequent they are less expensive to fix than dirt specs, whichare a rarer occurrence. Considering both cost and frequency will give you a betterunderstanding of your cost of poor quality (COPQ).