The report summarizes findings on evaluation studies conducted over a 6 year period at the Institute for Research on Learning Disabilities. Major findings are highlighted in the first chapter. Findings are grouped under the following topics: current evaluation practices, reading evaluation, spelling evaluation, written expression evaluation, oral language evaluation, mathematics evaluation, social adjustment evaluation, and data utilization. In chapter 2, implications for practice are noted, specifically the need for identifying alternative evaluation measures in the areas of reading, spelling, and written expression. Each of the eight major topics is then explored, in chapters 3 through 10, in terms of data sources and specific evidence. Sample findings include that most teachers rarely use systematic evaluation procedures to assess mastery of Individualized Education Programs goals and that teachers should be trained to use data for judging intervention effectiveness and improving student performance. Recommendations are made regarding direct measurement of reading, spelling, written expression, oral language, mathematics, and social adjustment. A final chapter, chapter 11, summarizes data sources for the research findings presented throughout the report. (CL)