Summary

In this chapter, the concept of needs has been explored and modeling associated with the different concepts covered has been discussed.

Initially, the importance of the concept of needs and the different types of needs, such as requirements and capabilities, was discussed. This led to understanding how to analyze needs in two ways: by describing each need using text-based properties and descriptions, and by gaining a true understanding of the underlying need by exploring the contexts of each need.

Context was introduced as one of the single most important aspects of needs modeling and, in order to establish this understanding, how important it is to understand the stakeholders that have an interest in the system. Each of these stakeholders has the potential to interpret each need in a different way to all other stakeholders, which is known as a modeling use case.

Each use case, and therefore its related need descriptions, must be validated, and two ways of validation...