A workshop on some preliminary chapters from my new book Effective Knowledge. Rethinking a Basic Concept of Political Epistemology. This book project is centred on the claim that it is possible, philosophically fruitful and politically relevant to think about the effectiveness of knowledge in such a way that this effectiveness is understood as nothing external to knowledge. My thesis is that »effective knowledge« in this sense does exist: there is knowledge that produces effects solely in virtue of its existence. In the book, I want to articulate a precise concept and to demonstrate why it is philosophically and politically significant to acknowledge the existence of »effective knowledge« and to have a clear concept for it.