Having made their fortune playing online poker,a and b skip town to go to the island of Kokomo to bask in the sun and drink margaritas (with salt), taking with them all of their scholarly works. In a bizarre hurricane, all information regarding the COCOMO II model is lost, except for the historical data from all programs which have used it (including ratings for each factor and final effort for each project). You know the original form of the models equation, but not the numerical values for each rating. You would like to rebuild the COCOMO II model. How would you determine appropriate numerical values for each factor rating level? Your colleague insists that another effort multiplier CHUMP, exists. Your history in cost estimation contradicts his claim. How would you determine that its effects are or are not worth modeling?