Use a weighted decision matrix when options exceed 3…

When This Fires

• When facing a decision with 3+ options and 4+ evaluation criteria
• When intuitive comparison feels circular — "I keep going back and forth" is the symptom of exceeding working memory
• For one-way door decisions (Classify every decision as one-way or two-way door before…) that warrant structured deliberation
• When multiple stakeholders need to see and agree on the evaluation logic

Common Failure Mode

Using matrices for simple decisions: building a weighted matrix to choose between two lunch options wastes time and creates false precision. The matrix is a power tool for complex multi-dimensional comparisons. For 2-option or 2-criteria decisions, a simple pro/con list or direct comparison suffices. Match the tool to the complexity.

The Protocol

(1) When a decision involves 3+ options and 4+ criteria, externalize into a matrix. (2) List criteria in rows, options in columns. (3) Assign weights to criteria before scoring any options (Assign criterion weights before scoring options — knowing…) — this prevents weight manipulation. (4) Score one criterion at a time across all options (Score by criterion across options, not by option across…) — this prevents halo effects. (5) Multiply scores by weights and sum columns. The highest total is the analytically preferred option. (6) Check: does the result match your gut? If yes → decide. If no → the gap between analytics and intuition contains important information. Investigate what your gut knows that the matrix doesn't capture before overriding either.