A decision matrix scores multiple options against weighted criteria. It turns a room full of opinions into a defensible choice. Snap the board and the rationale lives forever.
Use a decision matrix when you have multiple viable options and need to make a defensible, documented choice, selecting a technology stack, choosing a vendor, deciding between two strategic directions, or picking a design approach.
The matrix is most valuable when different stakeholders weight the criteria differently. Making those weights explicit and agreed-upon before scoring is often the most valuable part of the exercise.
The alternatives you're deciding between. Write one option per column across the top of the matrix. Include every viable option, leaving out a real contender undermines the exercise. Options should be at a similar level of specificity.
The factors that matter in making this decision. Write one criterion per row down the left side. Good criteria are things you can actually evaluate: cost, implementation time, team familiarity, scalability, vendor support. Avoid vague criteria like 'overall quality.'
The relative importance of each criterion, how much it matters compared to the others. Assign weights so they sum to 100%. The weighting discussion is often the most contentious and most valuable part: it forces the group to agree on what actually matters before anyone starts advocating for a specific option.
Each option's performance on each criterion, typically on a 1 to 5 or 1 to 10 scale. Score each option independently on each criterion. Don't let the score on one criterion influence the score on another. If you have domain experts in the room, defer to them on technical criteria.
Multiply each score by its criterion's weight and sum across all criteria for each option. The option with the highest weighted total is the matrix's recommendation. If the result surprises you, that's valuable information, your instinct and your criteria don't agree, and that's worth investigating.
Write the options across the top and criteria down the left. Aim for 3 to 6 options and 4 to 8 criteria. Too many of either makes the matrix unwieldy.
Discuss and agree on a weight for each criterion before scoring. This is the most important step, weight assignment forces the group to agree on what matters. Use dot voting if you can't reach consensus.
Score each option on each criterion independently. Do this silently first, then compare scores. Disagreements in scoring are valuable, they reveal different assumptions about each option's real performance.
Multiply each score by its weight. Sum for each option. Write the total at the bottom of each column. The highest total wins, but check whether the result matches the group's intuition.
If the matrix result contradicts the group's gut feeling, investigate the discrepancy, it usually reveals a criterion that's missing or a weight that's wrong. Once the group accepts the result, snap with BoardSnap to preserve the full scoring rationale.
Decision matrices built in spreadsheets produce outputs without context, you see the numbers but not the argument behind them. A decision matrix built on a whiteboard captures the argument: why certain criteria got their weights, why an option scored a 3 instead of a 4 on technical feasibility, what trade-offs the group accepted. That context is on the board in the form of side notes, arrows, and crossed-out scores.
BoardSnap reads the full matrix, options, criteria, weights, scores, and totals, and preserves the decision rationale as a structured summary. Six months from now, when someone asks why the team chose this technology, the snap is the answer.
Four to eight. Too few and the matrix doesn't differentiate between options meaningfully. Too many and the weights become micro-slices that don't reflect real priorities. If you find yourself with twelve criteria, cluster related ones or ask whether some are truly independent factors.
Set the weights before scoring. If you let people score first and then set weights, they'll consciously or unconsciously set weights that make their preferred option win. Weight-first discipline is the main guard against gaming the matrix.
Treat it as a signal, not a verdict. A counterintuitive result usually means one of three things: a criterion is missing, the weights don't reflect actual priorities, or a score is wrong. Work through each possibility before overriding the matrix. If you override it anyway, document why, that decision may be the most important thing to preserve.
Yes, the terms are interchangeable. Both describe the same technique: options scored against weighted criteria to produce a comparable total. The term 'decision matrix' is more common in product and business contexts; 'weighted scoring model' is more common in project management and procurement.
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