Math that makes sense

摘要

"Fail-Safe FMEA" (January 2012, pp. 30-36) is a good article. I was particularly interested in the explanation of the cause and effect matrix. Our company calls it a correlation matrix and just counts the number of boxes that have a number in them. That never really made sense to me. Cross-multiplying and addition makes much more sense; it shows where the critical areas are that you should focus on first.