A Teacher Survey was developed for administration to Illinois teachers whose students take the Illinois Inventory of Educational Progress (IIEP). The IIEP are the achievement tests of the state assessment program. The purposes of the Teacher Survey range from determination of a test's curricular validity to investigations of teachers' abilities to predict student performance. Teachers were asked to respond to these four questions concerning items on the IIEP: (1) To what extent have students been exposed to the content of this item? (2) How well does this item measure the content you are teaching? (3) How difficult is this item? and (4) What percentage of your students will get this item correct? Means analysis and inspection were performed on the data. Comparisons were made between the teachers' predictions and student performance on each item. In regard to the original four questions, the data indicated that the tests had curricular validity, evidenced content validity, and were of easy to moderate difficulty level. However, research on the Teacher Survey is very incomplete. The present data indicate that an individual teacher's estimates at a level greater than his/her own students are more likely to be in error than to be accurate. Several tables showing teacher underestimates and overestimates and standard deviations are included. (DWH)