Decoded Intelligence Signal
One-Variable Rule
advanced
strategy
Verified: May 27, 2026Lexicon Core Definition
The principle that when a system refinement is made, exactly one TSA component is changed at a time, with the hypothesis and expected impact documented, and 20 trades run before evaluating the change. The one-variable rule is the application of basic scientific method to trading system development — changing multiple components simultaneously makes it impossible to determine which change caused the performance shift.
Analysis Breakdown
The principle that when a system refinement is made, exactly one TSA component is changed at a time, with the hypothesis and expected impact documented, and 20 trades run before evaluating the change. The one-variable rule is the application of basic scientific method to trading system development — changing multiple components simultaneously makes it impossible to determine which change caused the performance shift. Full explanation coming soon when Journey 17 content is ingested.