As discussed here, the purpose of conducting a maintainability demonstration is to provide assurance that a specified maintainability index (i.e., MTTR, MDT, MMH/OH, etc.) will be attained during fielded operation. This is done by scheduling and execution of a demonstration test wherein maintenance tasks are performed at a specified level of maintenance (e.g., organizational, intermediate, depot) by personnel having the skill levels available or required in the fielded maintenance environment. For each maintenance task performed, where a typical task is to isolate and repair a failed unit, the time required to perform the maintenance task is recorded. Depending on the maintainability index being demonstrated, and the test plan chosen, once a statistically significant number of tasks are performed, the collected data are then used to determine if the maintainability is acceptable or not. In addition to the quantitative data collected during the demonstration test, qualitative information, such as the adequacy of test support documentation or ease of maintenance (accessibility, safety, etc.) is also collected and reviewed.