Figure 1: DARPA XAI Program Structure, including technical areas (TAs) and evaluation framework
The original program schedule consisted of two phases: Phase 1, Technology Demonstrations (18 months); and Phase 2, Comparative Evaluations (30 months). During Phase 1, developers were asked to demonstrate their technology against their own test problems. During Phase 2, the original plan was to have developers test their technology against one of two common problems (Figure 2) defined by the government evaluator. At the end of Phase 2, the developers were expected to contribute prototype software to an open source XAI toolkit.