Vicki Phillips, who heads the Gates education efforts, captured in this comment what I think they are really going for with
a composite evaluation score:
Not exact matches
The SCAT takes 15 - 20 minutes to complete and computes a
composite score, comprised of the Glasgow Coma Scale, a Standardized Assessment of Concussion (SAC)
score (cognitive and physical
evaluation, delayed recall), and a balance assessment
score (modified Balanced Error
Scoring System or BESS).
But all previous
evaluations of the effects of private schools or of school voucher programs reported test -
score results for both reading and math, or a
composite measure of the two, even if the researchers thought that one or the other was a better measure of school performance.
Not surprisingly, a
composite teacher
evaluation measure that mixes classroom observations and student survey results with test
score gains is generally no better and sometimes much worse at predicting out of sample test
score gains.
The focus of this report is on one piece of this very large set of transformations: the multiple measures and multiple methods used in new teacher
evaluation systems, including the weighting of these measures, to determine a
composite score of teacher effectiveness.
Requires that the most recent year's student growth
evaluation composite account for 35 percent of growth data in a teacher's
evaluation, if such use results in a higher
evaluation score.