functional and non functional requirements in software engineering

Functional and non-functional requirements are essential components in software engineering to define the desired behavior, functionality, and characteristics of a software system. Here’s a detailed explanation of both types of requirements in software engineering:

1. Functional Requirements:
Functional requirements describe the specific tasks or functions that the software system should perform. They outline the actions the system needs to execute and the responses it should produce. Functional requirements are typically related to the system’s behavior and the interactions between users or other systems.

Examples of functional requirements:
– The system must allow users to create and manage accounts.
– The system should provide a search functionality to allow users to find information.
– The system must support payment processing for online transactions.
– The system should allow users to generate and print reports.
– The system must enable users to send messages to other users.

2. Non-functional Requirements:
Non-functional requirements, also known as quality requirements, define the qualities, characteristics, or constraints that the software system should possess. They focus on factors beyond specific functionality, including performance, reliability, usability, security, and maintainability.

Examples of non-functional requirements:
– Performance: The system should respond to user actions within 2 seconds.
– Usability: The system must have an intuitive user interface with clear navigation.
– Security: The system should protect user data through encryption and secure authentication.
– Reliability: The system must have a 99.9% availability rate with minimal downtime.
– Maintainability: The system’s code should be well-documented and easily maintainable.

Both functional and non-functional requirements are crucial for developing software that meets the needs and expectations of users. Functional requirements outline what the software system should do, while non-functional requirements specify the qualities and constraints that define its overall behavior and characteristics.

We hope this article helped you to understand what are functional and non functional requirements in software engineering.


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