Measuring Teacher Effectiveness: Are We Creating an Education Nightmare?

We seem to be setting ourselves up for disaster education. Efforts are underway not only to adopt value-added models to rate the effectiveness of individual teachers, but to use these models to identify those at the very bottom who might later lose their positions and those at the very top who might then be eligible for merit pay. Yet in all the policy discussions and public commentary, there's been little focus on learners and on how, precisely, we define the qualities of a good teacher.
The movement to revise methods for teacher evaluation to include such models came about in an effort to undermine current evaluation systems that tend to rate most teachers as satisfactory (Hull, 2011). => http://bit.ly/ka9Fzo