At the heart of Set-Based Design is the concept that down-select decisions are deferred until sufficient information is available to make a decision, i.e., a set of possible solutions is maintained. Due to the extended service lives of many of our current and future systems, the horizon for accurately predicting the system’s requirement is shorter than the service life, so the needed information to down-select to a single optimized solution is unavailable at the time of fielding. Set-Based Design can, however, be extended to explicitly carry a set of possible solutions past the point of the initial fielding of the system by considering changeability, as enabled through designed-in reserve capacity to accommodate additional volume, weight, power, cooling, and computer performance. Proposed is an analytical framework that enhances Set-Based Design to engineer resilient systems with cost-effective post-production growth capability by means of reserve capacity and illustrate it through a case study
