(Based on parts of Chapter 3 of the author's EUI PhD Thesis, 1994.)Rather than exploring once again what the concept of power can mean for constructivists, this article analyses what constructivism implies for doing a conceptual analysis; here, of power. It will try to show that besides an analytical assessment (`what does power mean'), a constructivist conceptual analysis includes a study of the performative aspects of concepts (`what does `power' do'?), which, in turn is embedded into a conceptual history or genealogy (how has `power' become to mean and able to do what it does?'). The analysis will show that a neutral or descriptive meaning of power cannot be found, since the meaning of power is always embedded in a theoretical context; h...