If your initial Pareto analysis does not yield useful results, you may want to ensure that your categories are meaningful and that your "other" category is not too large. Examine the data for stratification or changes in the problem distribution over time. Data collected during long periods of time may include changes.Short periods of time may not be representative of your process as a whole. When the process is not in control, the causes may be unstable and the vital few problems may change from week to week. Because the data may not be reliable, you may get a misleading idea of the distribution of defects and causes. Data collected during a short period of time, especially from an unstable process, may lead to incorrect conclusions.The Pareto chart is simple to understand and use however, it is important to consider the following:
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