This collection of essays investigates the ontological and explanatory status of the concept of function within the biological and psychological sciences. Andre Ariew compiles contributions from fifteen prominent scholars to examine how scientists define and utilize functional attributions when describing natural systems. The text provides a rigorous analytical framework for understanding whether functions are grounded in evolutionary history, causal roles, or goal-directed behaviors.

Experts recognize this volume as a significant contribution to the philosophy of science, particularly for its focus on the conceptual foundations of functionalism. Readers frequently note the academic density of the prose, making it a primary resource for graduate-level study in philosophy of biology and cognitive science.