This core concept refers to defining the scope of a solution as part of the change strategy.

Let's look at an example to bring this concept of Solution into the real world:  

The change strategy that is developed for the New Orleans Electricity Company includes the transformation of paper-based statements into agreeable electronic statement templates. It doesn't include implementing a new customer portal to facilitate the retrieval or storage of those electronic statements. The scope of the solution in this scenario, therefore, excludes building a new customer portal. This, in turn, influences the change strategy that will be followed in terms of what solutions will be in scope to support the transition of customers from paper-based to electronic statements. 

This example illustrates how the core concept of Solution can be implemented during strategy analysis with the focus on defining the scope and ensuring the change strategy aligns accordingly.