What are the functional requirement and non functional requirements of a system?
Michael Gray
Updated on March 01, 2026
Functional vs Non Functional Requirements
| Functional Requirements | Non Functional Requirements |
|---|---|
| It is captured in use case. | It is captured as a quality attribute. |
| Defined at a component level. | Applied to a system as a whole. |
| Helps you verify the functionality of the software. | Helps you to verify the performance of the software. |
What are functional requirements in SRS?
Functional requirements in an SRS document (software requirements specification) indicate what a software system must do and how it must function; they are product features that focus on user needs.
What in an IT project are functional and non functional requirements?
While functional requirements define what the system does or must not do, non-functional requirements specify how the system should do it. Non-functional requirements define system behaviour, features, and general characteristics that affect the user experience.
What are the functional and non functional requirements of a library management system?
Non-Functional requirements: • Performance Requirements – Performance of the system should be fast and accurate. – System shall handle expected and unexpected errors. – Should be able to handle large amount of data. Safety Requirements – Must be two servers one main server and one backup server.
What are examples of functional requirements?
The list of examples of functional requirements includes:
- Business Rules.
- Transaction corrections, adjustments, and cancellations.
- Administrative functions.
- Authentication.
- Authorization levels.
- Audit Tracking.
- External Interfaces.
- Certification Requirements.
What is a functional requirement example?
“Any requirement which specifies what the system should do.” In other words, a functional requirement will describe a particular behavior of function of the system when certain conditions are met, for example: “Send email when a new customer signs up” or “Open a new account”.
What is a functional specification example?
A functional specification is a multi-page document that describes how the product or service will be provided. For example, it will describe the platforms the product/service will support, the development environment and tools to be used, and the technologies to be included during implementation.
How do you list functional requirements?
The list of examples of functional requirements includes:
- Business Rules.
- Transaction corrections, adjustments, and cancellations.
- Administrative functions.
- Authentication.
- Authorization levels.
- Audit Tracking.
- External Interfaces.
- Certification Requirements.
What are the functional and non-functional requirements for HMS?
In this blog, let’s check out the functional and non-functional requirements of the Hospital Management System in depth. There are a lot of software requirements specifications included in the functional requirements of the Hospital Management System, which contains various process, namely Registration, Check out, Report Generation, and Database.
How are non-functional requirements different from functional requirements?
Non-Functional Requirements : Non-functional requirements are not mandatory which means that they are not compulsory to be fulfilled. The non-functional requirements define system properties and system performance.
What is the functional requirement of a user?
Functional requirement of users is high-level abstract statements. it generally describes of what system should whenever required but system functions should be described in detail by functional system requirements.
