Methods. A broad-based research synthesis methodology was used for analyzing the current evidence base for TA using three frames: (1) applying the Getting To Outcomes (GTO) model for categorizing evidence on TA that specifies tasks for planning, implementing and evaluating TA; (2) understanding the relevance of a successful relationship between the TA provider and TA recipient; and (3) considering the extent to which TA fits the life-span needs of the preventive intervention.
Results. Results indicated high variability in the utilization of TA tasks. The apparent omission of systematic forethought in selecting and using tasks may be reflected in the finding that tasks were largely independent of the innovation life-span. Relationships are reported relatively frequently at multiple stages in the life-span.
Conclusions. Overall, this synthesis indicates that the rigor with which TA is being delivered is limited. We suggest that funders and other stakeholders develop and implement standards for TA quality in order to assure that many of these limitations are improved.