One of the books that’s had the biggest impact on my work is Donald Wheeler’s Understanding Variation: The Key to Managing Chaos. It’s the best guide for applying simple and powerful “statistical process control” (or SPC) practices to management data and decision making. A recently read a consulting case study, “Harris Methodist saves $648,695 through SIPOC process changes.” That’s a suspiciously precise number, but that’s not my real beef. The case study is a good … Continue reading Consulting Case Studies Need Statistical Validity