MODIA (Method of Designing Instructional Alternatives) was developed to help the Air Force manage resources for formal training by systematically and explicitly relating quantitative requirements for training resources to the details of course design and course operation during the planning stage. This report provides a comprehensive introduction to MODIA by describing options for training course design. Options are specified in MODIA in a step-by-step process managed by the User Interface (UI) component which produces computer-compatible data from which MODIA derives a description of the course operation. The report prepares and assists planners in making better use of MODIA by providing: (1) an overview of data and information that the UI required, (2) an understanding of the logical relationship within that data, (3) an understanding of the relevance of UI entries to the training course plans, (4) the range of choices that may be made, and (5) the pros and cons of each choice as they affect effectiveness and cost. In sum, this report parallels the structure of the UI component, and supplies its training-related rationale. (Author/DAG)