...provide[s] excellent introductions to the major problems and positions in the field. * Jonathan M. Kaplan, Philosophical Psychology * ... the book contains many interesting arguments, ideas and insights that could be employed and should be discussed by biologists, psychologists and philsophers interested in the philosophical problems of real science. * Acta Biotheoretica * a richly varied collection of essays which ... provides the reader with the opportunity for a sustained examination of the central issues concerning functions and their role in biology and psychology. * Graham Macdonald, Notre Dame Philosophical Reviews *