This article explores issues that had to be confronted over a three-year period in terms of two New York State funded grants for which I was the evaluator. Major, critical challenges are presented, described, and discussed. Specifically, the paper addresses issues related to lack of planning at the grant design stage that resulted in challenges…

Peer influence and social interactions can give rise to spillover effects in which the exposure of one individual may affect outcomes of other individuals. Even if the intervention under study occurs at the group or cluster level as in group-randomized trials, spillover effects can occur when the mediator of interest is measured at a lower level…