(Pareto Chart: Causes for defects in supplied items) 6. Helps to focus on causes that will have the greatest impact when solved.Displays relative importance of causes of a problem.Distinguish between vital few and trivial many.Pareto charts help experts in following ways: Pareto chart is having bars graphs and line graphs where individual factors are represented by a bar graph in descending order of their impact and the cumulative total is shown by a line graph.
The very purpose of Pareto Chart is to highlight the most important factors that is the reason for major cause of problem or failure. Pareto chart revolves around the concept of 80-20 rule which underlines that in any process, 80% of problem or failure is just caused by 20% of few major factors which are often referred as Vital Few, whereas remaining 20% of problem or failure is caused by 80% of many minor factors which are also referred as Trivial Many. Pareto chart is named after Vilfredo Pareto. (Fishbone Diagram: Missed deadline in manufacturing of product) 5. In manufacturing industry, to identify the source of variation the causes are usually grouped into below major categories: As a result we get a diagram with branches and sub branches of causal factors resembling to a fish bone diagram. We further keep identifying the sub factors leading to the causal of identified factors till we are able to identify the root cause of the problem. Once a quality related problem is defined, the factors leading to the causal of the problem are identified. The very purpose of this diagram is to identify all root causes behind a problem. (“Fishbone” or Ishikawa diagram)Ĭause–and–effect diagram introduced by Kaoru Ishikawa helps in identifying the various causes (or factors) leading to an effect (or problem) and also helps in deriving meaningful relationship between them.
(Check Sheet: Defect types with their occurrence on day of the week) 4. The very purpose of checklist is to list down the important checkpoints or events in a tabular/metrics format and keep on updating or marking the status on their occurrence which helps in understanding the progress, defect patterns and even causes for defects. When the information collected is quantitative in nature, the check sheet can also be called as tally sheet. Check sheet (Tally Sheet)Ī check sheet can be metrics, structured table or form for collecting data and analysing them. Histogram helps in prioritizing factors and identify which are the areas that needs utmost attention immediately. The very purpose of Histogram is to study the density of data in any given distribution and understand the factors or data that repeat more often.
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