This technical report provides an overview of the New York State Alternate Assessment (NYSAA), including a description of the purpose of the NYSAA, the processes utilized to develop and implement the NYSAA program, and Stakeholder involvement in those processes. By comparing the intent of the NYSAA with its process and design, the validity of the assessment's use can be evaluated. Starting with the 2013-14 NYSAA, a new test design was implemented for all content areas. For the 2013-14 NYSAA, new English Language Arts (ELA) and mathematics Extensions, which are aligned to the Common Core Learning Standards (CCLS), were developed. For science and social studies, Alternate Grade-Level Indicators (AGLIs) aligned to the New York State Learning Standards, development occurred in 2006-07 and 2007-08. The processes for developing the Extensions and AGLIs are presented in detail. Stakeholder input in the development of the overall NYSAA process itself is described in detail, including the content alignment of the Extension and AGLI design following the new Blueprint/test design, the Assessment Task development, the teacher trainings for administration, the Scoring Trainings and process, and the standard setting. This report is organized based on the conceptual flow of the NYSAA as a multi-year-long process, which includes Blueprint design/development (completed in 2012-13), Extension (completed in 2012-13) and AGLI (completed in 2006-07 and 2007-08) development, Assessment Task development (completed in 2012-13), administration (completed in 2014-15), scoring (completed in 2014-15), standard setting (completed in 2013-14), technical characteristics, and validity. The appendices contain supporting documentation.