The problem
Every team has decisions where gut feel isn't enough and someone needs to show their work. Vendor selection, technology stack choice, feature prioritization between competing options, go vs. no-go on a strategic bet — these decisions benefit from a structured matrix where criteria are weighted and options are scored against each criterion.
The whiteboard version of a decision matrix is fast to build and easy to debate. Write the options as rows, the criteria as columns, assign weights to each criterion (1-5 or percentage), score each option on each criterion (1-10), multiply, sum. The highest weighted total wins — or at least, the scoring makes it clear why the gut-feel winner isn't the mathematical winner, which is often the more useful output.
The problem is that a decision matrix on a whiteboard looks like a table of numbers. When the meeting ends, nobody can reconstruct the scoring rationale from a photo. Which option was preferred on which criterion? What was the weight assigned to 'implementation risk' versus 'feature completeness'? Those details are the decision's defensible rationale. They disappear with the whiteboard.