The "D&I Bridge": introducing a teaching tool to define the D, the I, and the why.

Interest in learning dissemination and implementation (D&I) science is at an all-time high. As founding faculty and fellows of a new center focused on D&I science, we have found that non-specialist researchers and newcomers to D&I science often express confusion around the difference between the D and the I. Relatedly, they struggle to identify what their specific D&I projects target to impact public health within the amorphous "black box" that is the singular, loosely defined "research-to-practice gap." To improve conceptual clarity and enhance engagement with D&I science, we developed a graphic-the D&I Bridge-and an accompanying glossary of terms to use as a teaching and framing tool. The D&I Bridge depicts D&I science as bridging what we know from public health knowledge to what we do in public health practice with intention and equity, and it spans over four distinct, inter-related gaps: the public health supply gap, the public health demand gap, the methodological/scientific gap, and the expertise capacity gap. The public health supply gap is addressed by implementation strategies, whereas the public health demand gap is addressed by dissemination strategies. The methodological/scientific gap is addressed by producing generalizable knowledge about D&I, and the expertise capacity gap is addressed by developing the multi-disciplinary workforce needed to advance D&I. Initial practice feedback about the D&I Bridge has been positive, and this conceptualization of D&I science has helped inform our center's D&I training, D&I project consultations, and strategic planning. We believe the D&I Bridge provides a useful heuristic for helping non-specialists understand the differential scopes of various D&I science projects as well as specific gaps that may be addressed by D&I methods.