This guide has been prepared to assist architects and specifiers in selecting windows to meet the requirements for specific jobs and conditions. It covers all classes of windows: storm, interior insulating, residential, commercial, heavy commercial and architectural. Design considerations provide information of significant value in planning for the best use of windows; therefore, a description of the various types of windows is available and a discussion of their particular characteristics is also included. Plus, performance requirements, as recommended by AAMA. Basic test method details are also reviewed.