The core concept of Need refers to how a solution or a solution component fulfills a need.

Let's continue our example to see how the concept of Need works in the real world:

By adding the functionality to allow online payments on Debby's Unique Dresses' existing website, this action further helps to meet the need of increasing sales for the business. 

This example illustrates how the core concept of Need is implemented during solution evaluation by considering how a solution or solution component fulfills business needs.