1.6 Evaluation matrices
When there are several courses of action, then one way of thinking clearly about the advantages and drawbacks of the different courses is to compile an evaluation matrix.
Box 1: Six steps to creating an evaluation matrix
List the various options.
Identify the criteria by which you will judge the options.
Give an importance weighting to each of the criteria. (The preferred option will be the one which has the highest weighted score.)
Give each option a raw score from 1 to 5 under each criterion. Write the raw scores in each ‘raw score’ column.
Multiply each raw score by the weight of each criterion in turn. This gives a weighted score for the option under each criterion. In the example below, the walking holiday is given a raw score of 1 for ‘Happy children’. That raw score is then multiplied by the weight of the criterion ‘Happy children’ (5), to give a weighted score of 5 in that column.
Add the weighted scores across the row for each option. The option with the highest weighted score is the winner. If two options tie, then the choice must be made either (i) randomly between the tied options, or (ii) in some other way (perhaps by a review of the matrix).