Put the sequence on a calendar
A hypothetical navigation program may first improve contact, then appointment attendance, then access to a relevant service. A downstream health outcome may require additional time and effective care after access.
If the evaluation ends before those steps could reasonably occur, it cannot fully test the final claim.
Use early signals for their proper job
| Measure | What it can show early |
|---|---|
| Referrals completed | Whether the pathway is functioning |
| Participant understanding | Whether communication is usable |
| Service uptake | Whether access changed |
These are useful observations, but none automatically establishes improved health.
Long follow-up has its own problems
People may move, receive other services, or become difficult to contact. Background conditions can change. A longer interval is not automatically a stronger causal design.
Predefine a realistic review schedule
Identify which decisions can be made from early implementation data and which require later outcomes. Include potential harms that need earlier attention rather than waiting for the final endpoint.
A program should not be declared ineffective merely because a slow outcome did not change immediately. It should also not be declared effective indefinitely on the promise that benefits will appear later without a plan to measure them.
