The Agile Alliance is the professional society that grew from the Agile Manifesto signing in February 2001 at Snowbird, Utah. It is the organizational home of the Agile conference circuit — particularly the annual Agile conference — which became a primary venue for mary-poppendieck and tom-poppendieck to present, develop, and debate lean software development ideas.
Role in Lean Software Development
The Agile Alliance did not originate lean software thinking, but it provided the community context that made it viable. When the Poppendiecks published lean-software-development-agile-toolkit-2003, the Agile Alliance had already established a practitioner community that had accepted the premise that heavyweight processes were failing and that lightweight, adaptive approaches were needed. This community was receptive to a lean framing because the seven-lean-principles were recognizably aligned with Agile values even while offering a different intellectual genealogy.
The annual Agile conference was particularly important as a feedback loop: the Poppendiecks' talks were a testing ground for ideas before and between books, and the conversations generated at those conferences shaped the successive volumes in the trilogy — implementing-lean-software-development-2006 and leading-lean-software-development-2009.
Relationship
mary-poppendieck served as Managing Director of the Agile Alliance, a formal leadership role that placed her inside the organization rather than merely adjacent to it. The Poppendiecks were active participants in the Agile Alliance community without being among the 17 Manifesto signatories. This outside-but-engaged position was productive: it allowed them to bring lean as a complementary framework rather than as a competing one, and to address gaps in the Manifesto community's thinking — particularly on value stream flow, organizational leadership, and the economics of software development that donald-reinertsen's work had formalized.