Summary
The Stacey matrix is a decision-making aid that sorts situations by two questions: how far the people involved agree, and how certain anyone can be about what needs doing. Management theorist Ralph Stacey drew the diagram in the 1990s, in his early work applying complexity science to organisations. Where agreement and certainty are high, standard procedures work. As both fall, situations become complicated, then complex, where the way forward emerges only through trial, learning and adaptation, and finally chaotic.
It’s often compared with the Cynefin framework and has been much adapted. Stacey later dropped it, arguing that it tidies away how uncertainty and disagreement keep shifting in real organisations.
Rationale
Deep disposition work belongs in the matrix’s complex zone: Part 1 calls it “messy, long-term and iterative”. Stacey’s retreat from his diagram is a caution for the framework Part 2 offers as “a prototype”.