Many prevention programs are denoted as failures before they ever have a chance to demonstrate their effectiveness. This occurs, in part, because it takes a tremendous amount of time and effort to implement prevention programs. A researcher performs a meta-analysis of evaluations of prevention programs. Her main finding is that prevention programs are not effective. She finds, however, that they are not effective because they were evaluated too early, when they were not yet fully developed. Her key finding is that successful prevention will only occur after successful implementation. Her research was an evaluation of:________.