Federal regulations (U.S. Department of Education, 2007a) provide states with the flexibility to offer an alternate assessment based on modified academic achievement standards (AA-MAS). This assessment option is for a small group of students with disabilities who can make significant progress, but may not reach grade-level achievement within the time period covered by their Individualized Education Program (IEP). Students who participate in an AA-MAS must have access to grade-level content. States are not required to offer this option. This report compiles, analyzes, and summarizes states' participation guidelines for the AA-MAS. All criteria included in this study were publicly available on states' Web sites. Specifically, this study sought to determine which states in July 2008 had participation guidelines for students to qualify to participate in an AA-MAS option and the characteristics of these guidelines. Summary figures are in the main body of this report, while the complete tables are presented in Appendix A. A comparison was made, where possible, to similar information in the 2007 report. All information in this report that refers to 2007 participation guidelines is from Lazarus et al. (2007). Appendix B contains a list of the documents used in this analysis. Appendix C contains a compilation of states' 2008 participation guidelines for those readers who would prefer to see the actual state guidelines. (Contains 7 tables and 4 figures.) [This report was funded with partial support from the Multi-state GSEG Toward a Defensible AA-MAS and the Alabama GSEG projects. These projects are supported by General Supervision Enhancement Grants from the Research to Practice Division, Office of Special Education Programs, U.S. Department of Education.]