This tool shows the relationship between the effect (reject) and its possible causes. It is used to logically group and identify all possible problems. It is also referred to as the “fishbone” or “Ish...

The following set of tools, which were developed for continuous process improvements, have been used successfully by different companies and organizations. They include techniques for collecting defec...

When factories approach six sigma quality, the need for control charts with their sampling-based methods is reduced. The quality team can review all of the defects that occurred each day in production...

The C chart is the most widely used chart in factories that are approaching six sigma. Since the defect rates are very low, binomial- based control charts would require a very large sample, and hence ...

All attribute control charts follow the same three sigma control lim. it away from the centerline methodology of the variable control charts:Control limits for attribute charts = centerline 土 3 s (3.8...

Example 3.5Assuming the number of defects in a part isλ= 5, What is the expected number of defects in a part? What is the probability of two defects?Up to two defects?Expected number of defects = 5Pro...

The Poisson distribution approximates the binomial distribution when the number of trials in) is large and the probability of each trial (p) is small. In this case the variable sometimes called the ou...

Example 3.3If the probability of failure of one part is 25%, what is the probability that the next two parts out of four are also failures?Example 3.4The probability of a failed part is 5%. If 20 part...