However, these evaluations did not find evidence that Tech Prep improved students' scores on standardized academic achievement tests, and findings were mixed on whether Tech Prep improved students' postsecondary achievement or labor market outcomes. The last national evaluation of Tech Prep programs, conducted in 1997, found that Tech Prep programs were not always implemented as envisioned in the legislation, perhaps lessening their impact on student outcomes.
On the other hand, these studies failed to discover any evidence that Tech Prep improved students' academic performance on standardized tests, and findings were split regarding whether Tech Prep enhanced students' post-secondary achievements or labor market prospects. The last nationwide evaluation of Tech Prep programs, carried out in 1997, revealed that Tech Prep programs often deviated from their intended objectives as outlined in the legislation, which may have reduced their impact on student results.