Extended Requirements

Functional Requirements

These are the requirements that the end user specifically demands as basic facilities that the system should offer. All these functionalities need to be necessarily incorporated into the system as a part of the contract....

Non-Functional Requirements

These are the quality constraints that the system must satisfy according to the project contract. The priority or extent to which these factors are implemented varies from one project to another. They are also called non-behavioral requirements. They deal with issues like:...

Extended Requirements

These are basically “nice to have” requirements that might be out of the scope of the System....

Difference between Functional Requirements and Non-Functional Requirements:

Functional Requirements Non Functional Requirements A functional requirement defines a system or its component. A non-functional requirement defines the quality attribute of a software system. It specifies “What should the software system do?” It places constraints on “How should the software system fulfill the functional requirements?” Functional requirement is specified by User. Non-functional requirement is specified by technical peoples e.g. Architect, Technical leaders and software developers. It is mandatory. It is not mandatory. 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. Functional Testing like System, Integration, End to End, API testing, etc are done. Non-Functional Testing like Performance, Stress, Usability, Security testing, etc are done. Usually easy to define. Usually more difficult to define. Example1) Authentication of user whenever he/she logs into the system.2) System shutdown in case of a cyber attack.3) A Verification email is sent to user whenever he/she registers for the first time on some software system. Example1) Emails should be sent with a latency of no greater than 12 hours from such an activity.2) The processing of each request should be done within 10 seconds3) The site should load in 3 seconds when the number of simultaneous users are > 10000...