Academics undertaking public policy research are committed to tackling interesting questions driven by curiosity, but they generally also want their research to have an impact on government, service delivery, or public debate. Yet our ability to capture the impact of this research is limited because impact is under-theorised, and current systems of research impact evaluation do not allow for multiple or changing research goals. This article develops a conceptual framework for understanding, measuring, and encouraging research impact for those who seek to produce research that speaks to multiple audiences. The framework brings together message, medium, audience, engagement, impact, evaluation, and affordance within the logics of different fields. It sets out a new way of considering research goals, measurements, and incentives in an integrated way. By accounting for the logics of different fields, which encompass disciplinary, institutional, and intrinsic factors, the framework provides a new way of harnessing measurements and incentives towards fruitful learning about the contribution diverse types of public policy research can make to wider impact.