The author shows that advisory boards in technology-based startups have seven different roles and functions: control, advice, networking, signalling, capital provision, co-management, coordination. It is shown that venture capital investors try to influence the importance of these roles in favour of control, coordination and co-management. Contrary to this, the satisfaction of founders as well as advisory board members increases with a higher importance of advice, networking and signalling. This analysis provides both qualitative and quantitative empirical data on the usage of those boards in practice.