Developing a typology of the roles public contributors undertake to establish legitimacy: a longitudinal case study of patient and public involvement in a health network.

Lived experience is only one of nine distinct public contributor roles. The WEAHSN provided a benign context for the study because in a health network public contributors are one of many parties seeking to establish legitimacy through finding valuable roles. The nine roles can be organised into a typology according to whether the basis for legitimacy lies in: the public contributor's knowledge, skills and experience; citizenship through the aspiration to achieve a broad public good; or being an outsider. The typology shows how public contributors can be involved in work where lived experience appears to lack relevance: strategic decision making; research unconnected to particular conditions; or acute service delivery.