The 30th anniversary of the 1981 Dahlem conference on Evolution and Development (Bonner 1982) presents an opportunity to assess the role of various kinds of approaches to problems, practices, and principles of interdisciplinary research as they contributed to patterns of conceptual change in different biological specialties over the second half of the twentieth century. Specifically, the integration (Hall 2000), extended synthesis (Pigliucci and Müller 2010), or “juncture” (Gerson 2007, 2015) of evolutionary and developmental biology—“Evo–devo,” “Devo–evo,” or “evolutionary developmental biology”—had roots in several specialties, including: molecular approaches to developmental biology, genetics, and systematics; functional, developmental and evolutionary morphology; paleontology; and, population and quantitative genetics approaches to the evolutionary synthesis.