Part 1 Looking backwards - teleology as etiology: teleological explanations in evolutionary biology, Francisco J. Ayala; functions, Larry Wright; biological teleology -questions and explanations, Robert N. Brandon. Part 2 Don't look back - nonhistorical approaches to biological teleology; the inference of function from structure in fossils, M.J.S. Rudwick; adaptation and the form-function complex, Walter J. Bock and Gerd von Wahlert; functional analysis, Robert Cummins; teleology revisited, Ernest Nagel; functions, John Bigelow and Robert Pargetter; where's the good in teleology?, Mark Bedau. Part 3 Critical developments: in defense of proper functions, Ruth Garrett Millikan; functions as selected effects - the conceptual analyst's defense, Karen Neander; function without purpose - the uses of casual role function in evloutionary biology, Ron Amundson and George V. Lauder; functions and goal directedness, Berent Enc and fred Adams; function, fitness and disposition, Sandra D. Mitchell. Part 4 Synthesis or pluralism?: the concept of function, R.A.; functional analysis and proper functions, Paul E. Griffiths; a modern history theory and proper functions, Peter Godfrey-Smith; function and design, Philip Kitcher. Part 5 Design: historical biology and the problems of design, George V. Lauder; exaptation - a missing term in the science of form, Stephen Jay Gould and Elizabeth S. Vrba; adaptation and the form-function relation, Carl Gans; biological function, adaptation, and natural design, Colin Allen and Marc Bekoff.