The WJ does go beyond high school level, by a little bit, while the highest item on the WIAT is early calculus, on the calculation side, and geometry, on the reasoning side. I would agree that the math ceiling is higher for the WJ. I would not be concerned about essay writing for WJ, as the writing tasks are all quite short. The WJ also does not have to be as long as it often is, if you administer the briefer versions of the composite scores (six subtests vs nine or more). I would seek clarification from the school regarding the exact names of the composites required for each achievement test.
ETA: just realized you might have been asking if a Written Expression composite could be obtained from the WIAT without an essay. Yes, for kindergarten through second graders, but not third and up.
Last edited by aeh; 05/27/17 05:06 AM.
