What does it mean that the decision matrix for multi-criteria choices?

Weight your criteria and score options systematically when multiple factors matter.

Example: You're choosing between three job offers. Each has a different salary, commute, growth trajectory, team culture, and technical stack. You can't hold all five dimensions across all three options in your head simultaneously — Cowan's 3-to-5 slot limit guarantees it. So you build a matrix: criteria down the left, options across the top, weights assigned to each criterion based on what actually matters to you right now, and scores filled in cell by cell. The offer that 'felt' weakest turns out to score highest because it dominates on the two criteria you weighted most heavily. The matrix didn't make the decision — it made visible what your intuition was averaging incorrectly.

Try this: Pick a real decision you're facing that involves at least three options and at least four criteria. Build a weighted decision matrix on paper or in a spreadsheet. First, list your criteria without assigning weights — just get them all down. Second, assign weights from 1 to 5 based on how much each criterion matters relative to the others. Third, score each option on each criterion from 1 to 10. Fourth, multiply each score by its weight and sum the columns. Compare the result to your gut instinct. Where they diverge, investigate why — the disagreement is the most valuable part.