It's obviously a good thing to consider all forms of evidence when providing performance feedback to employees. But teaching is not like golf, you can't reduce it to a single score for one contributor.
Eliminating "tenure" may be politically popular, but eroding due process and the 'just cause' standard creates an environment where even good teachers can be fired just 'cause it serves some other interest.
The German model is akin to the vision Obama articulated in his speech: high-end manufacturing that we export to the world. It's a good vision. High-end manufacturing should be a core part of our economy.
Social media has become a mobilizing force in bringing together students, educators, and parents who are frustrated with the data-driven, standardized, one-size-fits all learning taking place in publicly-funded schools today.
It's hard to win a war if you don't have good officers. It's even harder to build an excellent school if you don't have good administrators. Has there ever been a great school without a great principal?