Editing Software engineering (section)

=== Requirements analysis ===
{{Main|Software requirements}}

[[Requirements engineering]] is about elicitation, analysis, specification, and validation of [[requirements]] for [[software]]. Software requirements can be [[functional requirement|functional]], [[non-functional requirement|non-functional]] or domain.

Functional requirements describe expected behaviors (i.e. outputs). Non-functional requirements specify issues like portability, security, maintainability, reliability, scalability, performance, reusability, and flexibility. They are classified into the following types: interface constraints, performance constraints (such as response time, security, storage space, etc.), operating constraints, life cycle constraints (maintainability, portability, etc.), and economic constraints. Knowledge of how the system or software works is needed when it comes to specifying non-functional requirements. Domain requirements have to do with the characteristic of a certain category or domain of projects.<ref>{{Cite web|date=2018-06-19|title=Software Engineering {{!}} Classification of Software Requirements|url=https://www.geeksforgeeks.org/software-engineering-classification-of-software-requirements/|access-date=2021-05-06|website=GeeksforGeeks|language=en-us}}</ref>