A positive aspect of Shewhart charts is using control chart limits to avoid tampering with a process in a state of control. Includes a discussion of the rationale for using three as the multiplier of the standard deviation when setting control chart limits.

A positive aspect of Shewhart charts: a plot of the data. Includes a general discussion of the Hawthorne Effect.

Sliding door moments that led to a career in applied statistics

Overview of forthcoming discussion of my 1997 MS Thesis ”On Some Positive and Negative Aspects of Shewhart Charts”