This presentation provides an overview of public research and development (R&D) systems, indicators to measure their impact, and Tekes' model for assessing R&D impact in Finland. It discusses the rationale for public R&D systems in addressing market and systemic failures. Common R&D indicators are outlined that measure inputs, activities, outputs and impacts across areas like the economy, environment and society. Tekes' impact assessment model is presented which links objectives, impacts, outputs, activities and inputs across different impact domains. Examples of indicators used to measure impacts on the economy and environment are also given.