In his evaluation of the operational facets of "Follow Through", Elmore expressed concern that the shades of distinction among models in terms of structure made comparisons and final analysis among models problematic. Descriptions of the interventions derived from the sponsors themselves. There was no other reliable source from which the program administrators could obtain information about them. Had they been able to see examples of the different models being implemented, they might have been able to ask clarifying questions in order to better distinguish between them—which might have been important for purposes of assessment.