Because slices don't share a global schema, you need a contract for joining them. The rule is simple: Slice A can have a user_id that Slice B doesn't know about. Your BI tool must handle left joins gracefully. This is not a bug; it is a feature of resilience.
The ICE model democratizes decision-making. When a team sits down to score a project, the conversation shifts from "I think we should do this" to "Why do you rate the Confidence as a 9?" This forces a dialogue based on evidence. It uncovers hidden assumptions: a developer might rate a feature low on Ease because of technical debt, while a marketer might rate it high on Impact. The scoring process highlights these discrepancies, forcing the team to align before a single line of code is written. ice pie models
