This document contains the technical information for the 1998 Washington Assessment of Student Learning (WASL), Grade 4 Assessment for Reading, Mathematics, Listening, and Writing. It documents the technical quality of the assessment, including the evidence for the reliability and validity of test scores. The manual's chapters are: (1) "Overview and Background"; (2) "Item Development and Content Representation"; (3) "Evidence for Validity of Inferences from Test Scores"; (4) "Scoring the WASL Open-Ended Items"; (5) "Standard Setting Procedures"; (6) "Scale Scores"; (7) "Reliability"; and (8) "Description of Performance of Grade 4 Students." Five appendixes contain information on the state's essential academic learning requirements, the test specifications, scoring criteria, and the technical advisory committee. (Contains 57 tables and 3 figures.) (SLD)