PMI lists Plus (positive attributes), Minus (negative attributes) and Interesting (interesting attributes) for a certain alternative and scores them.
Executing the Method
For each alternative, generate positive attributes, negative attributes, and interesting attributes.
Score each of these attributes, preferably on a 1-5 scale. Positive attributes get a positive score, while minus attributes get a negative score and interesting attributes can either get a positive or negative score.
Sum these scores for each individual alternative.
Select Best Scoring Alternative
Make a selection based on the scores, where the best scoring alternative(s) is most likely to be chosen.