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Why do decision factors contain decimal points?

Hi! Why do decision factors in the solution contain decimal points? I would have just used the one given in the exhibit: 1 - low, 2 - medium and 3 -high. 

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Holger
Coach
on Jun 14, 2024
6+ years of consulting experience | Bain and Stern Stewart | 50+ first and second round interviews

Hi Regina,

 

you have to consider the additional information and multiple the decision factor by it:

Solution given assumes following decision factors:
Qualitative – 0.3
Quantitative – 0.2
Cost – 0.5

 

e.g., digital capability for supplier A is medium (2) → 2x 0.3 (0.3 because it is a qualitative factor) = 0.6 (as shown in the solution)

 

Hope that helps

Best

Holger

on Jun 15, 2024
#1 rated McKinsey Coach
on Jun 16, 2024
Hi Holger and Christian, thank you for your replies! My problem was not the math itself but rather that I do not understand where the decision points come from. Could you please clarify it? Best, Regina
Pedro
Coach
on Jun 17, 2024
Bain | EY-Parthenon | Former Principal | 1.5h session | 30% discount 1st session

The specific weights of each decision factor would be given by the interviewer.

In reality the expectation is that you recognize you need those decision factors and need to “weight” them in order to reach a final decision. But, regarding the specific weights, either you assume them or the interviewer provides them (both options would be fine in the context of an interview)

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