Drawing together, inter alia, evolution, development, population genetics, developmental biology, paleontology, cell and molecular biology, and ecology in an effort to explore how developmental mechanisms and processes evolve and how development may drive evolutionary change, EDB is often described as an 'integrative project' (Sarkar and Robert in press). But what, precisely, does it mean to integrate biological disciplines? A number of philosophers of science have explored this question in the past three decades, providing very useful tools for conceptual analysis. But a full scale assessment of integrating biology, using EDB as a case study, has yet to be completed.