01 Pugh, S. (1991). Total Design: Integrated Methods for Successful Product Engineering. Addison-Wesley.
If your decision is based on multiple criteria, one- or two-dimensional approaches (for example, the idea portfolio) might not seem enough. A decision matrix  allows multiple weighted criteria to be incorporated in the decision, but lets us consider them one at a time.
The options available are listed along one axis of a table; the various decision factors along the other. The decision factors may be weighted. The team consider each criterion for each option and give it a value, modified by the weighting. The arithmetical result suggests which option to address first. This method is especially welcomed by analytical thinkers.