This collection of essays by a leading philosopher of science defends integrative pluralism as the best description for today's complexity of scientific inquiry. The tendency of some scientists to reduce all theories to a few fundamental laws of the most basic particles that populate our universe is not appropriate for the biological sciences, which study multi-component, multi-level, evolved complex systems. This book will be of interest to students and professionals in the philosophy of science. – Contents : 1. Introduction. – Part I. Complexity: 2. Constitutive complexity; 3. Dynamic complexity; 4. Evolved diversity. – Part II. Pluralism: 5. Laws; 6. Pluralism or disunity.