── ── Cognitive bias
Halo Effect
A single positive or negative impression biases judgments of all unrelated attributes. A "great" CEO is assumed to have great strategy, vision, and execution; a beloved brand's features are rated higher than equivalent features from less-loved brands. Documented by Thorndike (1920), formalized by Nisbett & Wilson (1977), applied to business analysis by Rosenzweig (2007) — who showed business books overclaim…
How it works
Composes with fundamental-attribution-error, narrative-fallacy, confirmation-bias, hindsight-bias, survivorship-bias.
When to use it
- user is conducting a performance review or hiring interview
- someone says 'she's great across the board' or 'everything they do is excellent'
- user is evaluating a vendor, CEO, or investment and all attributes look uniformly positive or negative
- user is reading business books or analyst reports and wants to assess whether the lessons generalize
- user suspects their overall impression of a person or brand is distorting specific judgments
When not to use it
When the decision is routine and reversible, applying a formal method costs more than it returns.
Worked example
Thorndike 1920 + Nisbett-Wilson 1977 + Rosenzweig 2007 Business Application
Edward L. Thorndike (1874–1949) was an American educational psychologist whose 1920 paper documented the halo effect in military officer ratings. Thorndike was an early figure in the psychology of learning (his "law of effect" was foundational) and also a pioneer of psychological measurement. His 1920 paper was a methodological critique of trait-rating: he showed that supposedly independent traits were rated so similarly that the raters could not be assessing them independently.
Install this skill (free, MIT)
npx skills add deciqAI/knowledge-skills