How to Create a Decision Matrix
4.Establish performance parameters (utility scores) for each of the objectives
•It is necessary to convert the statement of objectives into parameters that can be measured.
•The easiest way is to use five grades scale (0-4) with the following ranking:
•Far above average – Excellent (4)
•Above average – Very good (3)
•Average - Good (2)
•Below average - Satisfactory (1)
•Far below average - Not satisfactory (0)
•Base the parameter estimation on common sense, your existing knowledge, calculations, research on web, catalogs, etc.
•REMEMBER: If your estimates are bad, then the resulting decision matrix results will be bad
5.Calculate and compare the relative utility values of the alternative designs
•In general, higher values mean better concept variant
General Procedure:
In groupthink cohesiveness is valued more than good decisions.  Decisions are made based on pressures OTHER THAN evaluating facts and finding the best answer.  Challenger example is taken from the textbook, page 125.
In the Challenger disaster, it was determined that failure of the O-rings due to freezing temperatures caused the explosion.