Conflict Explanation. A structured account of why a requested state cannot be satisfied: which constraints conflict, which dependency or evidence facts caused the conflict, and what would need to change before the request can proceed.
The CAM README exposes the concept directly: weak dependency solving leaves difficult conflicts or missing explanations, while CAM's solver uses backtracking, conflict detection, and human-readable conflict explanations. The idea generalizes beyond packages: governed systems should explain why they stop, not merely announce that they stopped.