The architecture of a system is the set of significant decisions and the trade-offs accepted to reach them — not the diagram, which is residue. Decision Architecture makes the practice explicit: classify a decision by reversibility, decide through an advice process with one named owner, and capture it as an architecture decision record that is superseded rather than edited.
It optimises for decision quality and decision velocity together. The framework is Decision Architecture; the underlying argument is Architecture Is Not About Technology — It Is About Decision-Making. The same idea scales up one level — from a system’s technical decisions to an organisation’s decisions about AI (who decides, on what evidence, how reversibly) — developed in The Decision Architecture of AI.