In relation to the problems faced today, in contemplation and in practical affairs, philosophers must confront the question `What is knowledge?', and consider whether knowledge has lost its object. Such was the problem placed before the seminar convened by the Philosophical Society of Turkey at Ankara in 1989. The 17 papers derived from the lectures and discussions deal with problems of knowing and believing, of the kinds and criteria of knowledge, of truth and fallibility, and of the cultural as well as individual factors in cognition. The authors include Guido Küng, L. Jonathan Cohen, Ernest Sosa, Arda Denkel, Venant Cauchy, David Evans, Gürol Irzik, Ioanna Kuçuradi, Evandro Agazzi, Richard T. DeGeorge, Kwasi Wiredu, Teo Grünberg, H. Odera Oruka, Jindrich Zeleny, V.A. Lektorsky, Anna-Teresa Tymieniecka, and Francisco Miro Quesada. There is a critical and analytical Prologue by the convener of the Seminar, Ioanna Kuçuradi.