This project aims to systematise what we know about intervention as element of science technology studies (STS), by investigating the relation between interactions with 'clients' in the pursuit of STS research. The project builds upon earlier work by the BMG group and the VKS and will extend this to a framework for systematic comparative, post-hoc research through a series of ±20-25 interviews, over the course of 18 months. The interviews will be conducted with leading researchers whose work falls within STS, or whose work demonstrates interventionist features: problematic interaction between different research goals, and maintenance of an STS research agenda. The interviews will be analysed with respect to apparently recurrent themes and interconnecting theoretical insights. The tagged material will also be the basis of organised reflexive discussion among participating scholars and the project researchers.The results willl be published in the form of an edited book or a special issue of one of the STS journals. The project will culminate in a session of papers to be delivered at the combined 4S-EASST conference to be hosted at Erasmus University in August 2008.