Compare mechanism options using a weighted scoring matrix. Set your criteria and weights, score each option, and let the math make the decision — then document the result in your notebook.
The decision matrix applies multi-criteria decision analysis (MCDA) — a formal mathematical framework for making decisions when multiple competing objectives must be satisfied simultaneously. Each criterion is assigned a weight reflecting its relative importance, and each option is scored. The weighted sum — ∑(weightᵢ x scoreᵢ) — converts a multi-dimensional comparison into a single defensible number. MCDA is used in engineering, military procurement, and medical device selection.
🎤 Interview line: “Every major design decision we make goes through a weighted decision matrix. We define criteria, assign weights based on our design goals, score each option independently, and select the highest-scoring option. When we deviate from the matrix, we document why. Judges see this process clearly in our notebook.”
Your decision matrix gives Option A a score of 4.1 and Option B a score of 3.8. The team prefers Option B. What should happen?
⬛ Pick Option B — team morale and buy-in outweigh marginal matrix differences
⬛ Pick Option A and document why — the matrix result should be followed unless there is a specific documented reason to override it
⬛ Run both in parallel until field testing reveals the better performer
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Notebook entry tip:Select Best Solution — Purple slide — Show the complete filled matrix in your notebook — every option, every criterion weight, every score. Write a conclusion paragraph citing the specific score difference. Judges look for the full matrix, not just the winner. A team that writes "we did a matrix" without showing it scores no better than a team with no matrix.