Principlev1PR-1078
Change only one variable at a time when testing improvements
Change only one variable at a time when testing improvements so that observed effects can be attributed to specific causes rather than confounded with simultaneous changes.
Why This Is a Principle
Core principle of experimental design derived from axioms about causal narratives (Automatic Narrative Generation Precedes Conscious Evaluation), unreliable self-assessment (Illusion of Explanatory Depth), and bias blind spot (Bias Blind Spot Asymmetry). Prescribes isolation methodology to enable valid causal inference despite these cognitive limitations.