The Halo Effect: . . . and the Eight Other Business Delusions

Why this matters here

Phil Rosenzweig’s The Halo Effect shows how overall performance judgments contaminate attributions about strategy, culture, leadership, and metrics—success creates illusions of knowing why. How Serious Systems Learn extends that diagnosis into a validation effect: results under specific conditions are often misread as proof the system is robust across changing ones. Rosenzweig catalogs managerial delusions; the book treats success as a trigger for deeper scrutiny rather than relaxed discipline.