He is a frequent commenter on this blog. The debate that Ed in the Apple discusses in Teacher Evaluation: The Student Learning Objectives (SLO) Monstrosity Looms Over Teachers and Principals (https://mets2006.wordpress.com/2012/12/05/teacher-evaluation-the-student-learning-objectives-slo-monstrosity-looms-over-teachers-and-principals/ ) is certainly the one taking place right now, but its very complexity should alert everyone to how ridiculous it is to try to boil an activity as complex as teaching down to a simple formula for success or failure.