Translational gap
Also known as: Research–practice gap, Know-do gap
The chronic gulf between what research shows works and what actually gets used in policy and practice.
What it means
The translational gap is the persistent failure of evidence to reach application: interventions proven effective in studies are adopted slowly, partially, or not at all, while practice runs on habit, tradition, or weaker evidence. Often cited estimates suggest it can take many years for research to enter routine use, and much never does. The causes are layered — misaligned incentives, lack of fit to local context, weak implementation support, and the distance between researcher and practitioner worlds — which is why implementation science and pragmatic trials arose to bridge it. A symmetric gap runs the other way: practitioners' real questions often never reach researchers. It matters because the gap, not a shortage of knowledge, is frequently the binding constraint on public benefit — the bottleneck is delivery, not discovery.
Examples
Decades after trials proved their value, many effective behavioral treatments remain unavailable in routine care — the knowledge exists but never crossed the translational gap.
Cognitive science settled decades ago that spaced self-testing beats re-reading, yet most revision guides and classrooms still run on highlighters. The finding is not in doubt; it simply never arrived.
Hospitals have known since the nineteenth century that hand hygiene prevents infections, and improving compliance on the ward remains an active project. The evidence was never the bottleneck; delivery was.
First described in Health and policy research discourse.