Doing more with what we know: introduction to the special issue.

This article introduces a special issue that provides an overarching conceptual model for advancing the impact of science on service delivery and includes some illustrations of these concepts in action from a variety of research teams in a diversity of contexts. Themes of the special issue include balancing considerations of efficacy, effectiveness, and extensiveness--for example, ensuring that treatments are not only reliable but also robust and widely relevant. It is argued that such a balance might be achieved through an increased focus on improving coordination of system resources (e.g., clients, providers, treatments, training programs) and through dynamic and developmental designs. The special issue is intended to raise the broader question of whether our current paradigms are satisfactory in moving us toward our shared vision, or whether we could do more with what we already know.