Government R & D funding and company behaviour : measuring behavioural additionality How does government funding of corporate R&D affect the behaviour of firms Ongoing efforts to boost business investment in R&D demand better methods of evaluating the effectiveness of government policy instruments. Efforts to explicitly measure changes in the ways firms conduct R&D as a result of government policy so called behavioural additionality effects have remained relatively underdeveloped. This publication explores the emerging concept of behavioural additionality and summarises results of a multinational effort to develop better ways of measuring it.