More on that awful Gates study
One thing that struck me right away with this report is that the inclusion of student surveys — something that aren’t realistically ever going to be a significant part of high stakes teacher evaluations — is given such a large percentage in each of the three main weightings they consider (these three scenarios are, for test scores-classroom observations-student surveys, 50-25-25, 33-33-33, and 25-50-25.)
Conspicuously missing from the various weighting schemes they compare is one with 100% classroom observations. As this is what many districts currently do and since this report is supposed to guide those who are designing new systems, wouldn’t it be scientifically necessary to include the existing system as the ‘control’ group? As implementing a change is a costly and difficult process, shouldn’t we know what we could expect to gain over the already existing system?
[readon2 url="http://garyrubinstein.teachforus.org/2013/01/13/50-million-3-years-no-clue/"]Read the whole piece[/readon2]