Mr. Rogers' IB Design Technology

Decision Matrix For a Stair Climbing Robot

Note that the weighting factors are arbitrary. They can be 1 to 3, 1 to 5, 1 to 10, 1 to100, or any combination that represents the nature of the project. Weights should be adjusted to match requirements. In this case stair climbing ability was essential.

Each criterion is given a rating. (Again it's arbitrary but should reflect the project.) The rating is multiplied by the weight and then summed for each alternative. The result is an overall score which indicates the best alternative. Generally the matrix is set up so that higher numbers indicate greater desirability.

Criterion

Weight Alternatives
Tank Track Tri-Wheel Wheel
Stair climbing ability 5 5 25 5 25 1 5
Load on stairs 4 3 12 4 16 1 4
Available parts 3 2 6 5 15 5 15
Complexity 2 3 6 4 8 1 2
Cost 1 2 2 2 2 4 4
Total Score   51   66   30