Low cost is paralled by low precision in estimating impact. Distribution may not be an adequate alternative, especially among population segments with low education or receptivity. Trends in risk factors and disease provide a measure of efficacy. The ability to discern the specific impact of AHA efforts from those of other agencies is limited. A registry of program participants permits audience characterization and follow-up.
Registries can be costly in terms of staff time and participant burden.
Evaluation is critical to learn what works and to avoid wasting resources on what doesn't. Accurate evaluation data that meet standards of validity and reliability are often expensive. It is desirable to evaluate changes in various population subgroups. Evaluation resources are limited and require a focus on testing audiences likely to make changes. Inc. All rights reserved.