These are the appendices for the report "The Effects of an Academic Language Program on Student Reading Outcomes." This study investigated WordGen Elementary, a program designed to improve fourth- and fifth-grade students' ability to understand and communicate academic language and their general reading skill. The program provider offered training and ongoing professional development activities designed to support teachers' delivery of the associated curriculum in their class rooms. About sixty schools from six districts around the country were assigned at random to implement the program or continue with their typical language instruction programs and practices. The study gauged the program's effects on student outcomes by comparing the average student reading performance of these two groups of schools. This document provides supporting details on the academic language program being evaluated, the research activities carried out by the study team, and supplementary analyses for the findings presented in the report. The following four appendices are included: (1) The Academic Language Program; (2) Study Design, Data Collection, and Analytic Approaches; (3) Supplemental Information on Findings in the Report; and (4) Supplemental Findings. [For the full report, see ED622459. For the Study Highlights, see ED622460.]