This report is the first of two volumes which document the Instructor Support Feature (ISF) Guidelines for aircrew training. Designed to provide a communication vehicle among personnel involved in the acquisition process for new aircrew training devices (ATDs), these guidelines focus on the development of specifications for the instructional component within the total simulation system. This report is divided into four sections. The introduction presents background information on the project as well as the major conclusions reached through research and development activities. In the second section, the description of project activities that were conducted to develop the ISF guidelines provides a general overview followed by a detailed description of the major activities. The third section presents the findings of the investigations and analyses for each feature. The fourth section presents eight major conclusions and recommendations. A list of 14 references and a 26-item bibliography are also included, as well as a glossary of terms and a list of abbreviations and acronyms. Six appendices include a list of training sites visited, an interview guide used to collect data, a list of course documentation for various ATDs, an annotated listing of systems with advanced instructor support capabilities, a list of documentation on these systems, and a detailed comparison of internal ISS features among these four systems. (DJR)