Chapter 5 of the book “Software Engineering: A Practitioner’s Approach” is about understanding requirements.

The authors begin by introducing the concept of requirements and the importance of understanding them correctly. They explain that requirements can be defined as descriptions of what a system should do or achieve, and that they can be functional or non-functional.

Further, the authors discuss the importance of identifying the requirements correctly and involving all relevant stakeholders in the process. They also provide tips on how to gather requirements and suggest different techniques such as interviews, workshops, and scenario analysis.

The authors also point out that it is important to validate and verify the requirements to ensure that they are correct, consistent, and realistic. They suggest techniques such as inspection and prototyping to assist with this process.

Finally, the authors discuss how the requirements should be documented and organized. They suggest that the requirements should be described in a structured manner and use techniques such as use case diagrams and requirements specifications to do so.

Overall, Chapter 5 focuses on the importance of understanding and gathering requirements correctly in a software engineering process and provides practical tips on how to achieve this.