  Felix Schuster focused his work on the philosophy of social sciences. His book, Explicación y predicción: La validez del conocimiento en ciencias sociales, published in 1982, is a classic that has been reprinted numerous times. In this work he was concerned with the methodology and validity of sociology, history, economics, anthropology, psychology and psychoanalysis, as well as the structure and predictive possibilities of the various  theories.[6]