PMI lists Plus (positive attributes), Minus (negative attributes) and Interesting (interesting attributes) for a certain alternative and scores them.
Executing the Method
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Generate Attributes
For each alternative, generate positive attributes, negative attributes, and interesting attributes.
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Score 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.
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Sum Scores
Sum these scores for each individual alternative.
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Select Best Scoring Alternative
Make a selection based on the scores, where the best scoring alternative(s) is most likely to be chosen.