Much thought has been accorded to the evolving nature of business history. It is only relatively recently, however, that attempts have been made to articulate methodological issues in a more epistemologically explicit and reflexive fashion. This article contributes to this burgeoning agenda by examining the methodology underpinning an intensive archival study of the British interwar management movement (1918–1939), a major force in British management education between the wars. We explicate the methodology employed and question what this material tells us about the interwar management movement, in terms of its determination to modernize management, encourage openness between firms, and extend a new spirit of partnership. We show that the interwar management movement was characterized by organized cooperation and methodological openness. Our main contribution is to demonstrate that interpretations themselves can become entrenched and prone to inertia, inviting us to revisit these periodically and, if appropriate, recast them.