"Aus den Besprechungen: ""Although this volume appears as a set of "Lecture Notes," in fact it is a rather polished and complete text on homotopy theory, from the viewpoint of offering a very careful examination of the foundations. The authors introduce the notion of homotopy in general, and then launch into an elaborate study of cofibrations. The second major chapter concerns fibrations. The last chapter centers around homotopy sets and groups, induced homomorphisms and exact sequences, excision in the stable range and suspension. It is a well polished piece of exposition, suitable for a reader who knows point-set topology and basic category theory." "Mathematical Reviews"