Using Ishikawa diagrams to improve quality

Cause-effect diagrams are a useful technique that can be used to improve quality.  Glenford J. Myers wrote that “a weakness of boundary value analysis and equivalence partitions is that they do not explore combinations of input circumstances”[1]. A technique that can be used to explore and describe combinations of inputs to an issue is a …

Using the Five Whys to improve quality

The Five Whys is a technique for finding the root cause of a problem. Toyota developed this technique and it is now widely used, including in software development. I was introduced to the Five Whys by Tom Gilb as part of a course he ran on Lean QA and have used the Five Whys in …

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