My library of university economic-impact studies is reasonably popular, so I am beginning a parallel collection of impact studies on tbed programs and organizations. I am generally more sympathetic to this kind of evaluation, since at least the counterfactual condition — no program at all — is credible. However, there are still measurement questions. If you are a copyright owner and have a problem with your study being posted here, just let me know and I will replace it with a link to your site.
TBED impact studies