How do you measure whether a nonprofit implementation succeeded?

I push for measures the implementation can actually influence, and I insist on a baseline before go-live.

1. Total revenue raised is the measure everyone reaches for, and it is the weakest. One bequest or one lost grant swamps any system effect.
2. Better measures are operational and behavioural: donor retention rate, recurring gift attrition, time from gift received to acknowledgement sent, time to process a batch, percentage of programme enrolments with complete intake data, percentage of grant reports received on time.
3. I capture the baseline during discovery even when it is a rough estimate from staff, because a rough baseline beats no baseline when the board asks what changed.
4. Finally I agree who reports these and how often. A success measure nobody owns quietly stops being reported about four months after go-live.