This paper consists in lecture notes and materials for a postgraduate course on metafiction at the University of Zaragoza (1991). Contents include: 1. Introduction; 2. Reflexivity and Metafiction: Some Related Concepts; 3. The Reflexive Novel; 4. Reflexive Devices in Fiction; 5. Theory of Reflexive Fiction; 6. Metafiction as Thought; 7. Postmodernism and Reflexivity, appendixes and a bibliography of criticism on metafiction up to 1990.