How would you measure whether a delivered Salesforce solution actually succeeded?

1. Define the measure before build, during discovery, along with a baseline. A metric invented after go-live is nearly always chosen to flatter the result.
2. Prefer outcome measures tied to the business objective — cycle time, error rate, conversion rate, time to resolution — over output measures like the number of stories delivered.
3. Include adoption measures, because a solution nobody uses cannot deliver an outcome: active users, feature usage, and the proportion of transactions still being completed through the old workaround.
4. Use the platform's own instrumentation where it fits: reports and dashboards on the relevant records, field history for cycle time, and login and usage data for adoption.
5. Agree the measurement window and the owner in advance. Benefits realisation typically needs 60 to 90 days after go-live before the numbers mean anything, and someone has to be accountable for reporting them.