Contemporary teacher evaluation systems are built upon multiple measures including, primarily, teacher-level value-added and observational estimates. While researchers have conducted examinations of these systems and indicators, researchers have not investigated how using these systems might distort the validity of the inferences being drawn,…

The Every Student Succeeds Act prohibits the federal government from requiring the use of student achievement data for teacher accountability purposes. As states grapple with what to do about teacher accountability, it is critical to examine policy influences on a) the equitable distribution of effective teachers; and b) how teacher accountability…

This study examines the effects of the summer period on value-added assessment (VAA) of teacher and school performance at the early grades. The results indicate that 40-62% of the variance in VAA estimates originates from the summer, depending on the outcome. Furthermore, when summer is omitted from the VAA model, 51-61% of the teachers and 58-61%…