[requirements] What is the difference between functional and non-functional requirements?

What is the difference between functional and non-functional requirements in the context of designing a software system?

Give examples for each case.

Functional requirements

1. Functional requirements specifies a function that a system or system component must be able to perform. It can be documented in various ways. The most common ones are written descriptions in documents, and use cases.

2. Use cases can be textual enumeration lists as well as diagrams, describing user actions. Each use case illustrates behavioural scenarios through one or more functional requirements. Often, though, an analyst will begin by eliciting a set of use cases, from which the analyst can derive the functional requirements that must be implemented to allow a user to perform each use case.

3. Functional requirements is what a system is supposed to accomplish. It may be

   • Calculations
   • Technical details
   • Data manipulation
   • Data processing
   • Other specific functionality

4. A typical functional requirement will contain a unique name and number, a brief summary, and a rationale. This information is used to help the reader understand why the requirement is needed, and to track the requirement through the development of the system.

Non-functional requirements

LBushkin have already explained more about Non-functional requirements. I will add more.

1. Non-functional requirements are any other requirement than functional requirements. This are the requirements that specifies criteria that can be used to judge the operation of a system, rather than specific behaviours.

2. Non-functional requirements are in the form of "system shall be ", an overall property of the system as a whole or of a particular aspect and not a specific function. The system's overall properties commonly mark the difference between whether the development project has succeeded or failed.

3. Non-functional requirements - can be divided into two main categories:

   • Execution qualities, such as security and usability, which are observable at run time.
   • Evolution qualities, such as testability, maintainability, extensibility and scalability, which are embodied in the static structure of the software system.
4. Non-functional requirements place restrictions on the product being developed, the development process, and specify external constraints that the product must meet.
5. The IEEE-Std 830 - 1993 lists 13 non-functional requirements to be included in a Software Requirements Document.

1. Performance requirements
2. Interface requirements
3. Operational requirements
4. Resource requirements
5. Verification requirements
6. Acceptance requirements
7. Documentation requirements
8. Security requirements
9. Portability requirements
10. Quality requirements
11. Reliability requirements
12. Maintainability requirements
13. Safety requirements

Whether or not a requirement is expressed as a functional or a non-functional requirement may depend:

• on the level of detail to be included in the requirements document
• the degree of trust which exists between a system customer and a system developer.

Ex. A system may be required to present the user with a display of the number of records in a database. This is a functional requirement. How up-to-date [update] this number needs to be, is a non-functional requirement. If the number needs to be updated in real time, the system architects must ensure that the system is capable of updating the [displayed] record count within an acceptably short interval of the number of records changing.

References:

1. Functional requirement
2. Non-functional requirement
3. Quantification and Traceability of Requirements

Functional requirements are those which are related to the technical functionality of the system.

non-functional requirement is a requirement that specifies criteria that can be used to judge the operation of a system in particular conditions, rather than specific behaviors.

For example if you consider a shopping site, adding items to cart, browsing different items, applying offers and deals and successfully placing orders comes under functional requirements.

Where as performance of the system in peak hours, time taken for the system to retrieve data from DB, security of the user data, ability of the system to handle if large number of users login comes under non functional requirements.

functional requirements are the main things that the user expects from the software for example if the application is a banking application that application should be able to create a new account, update the account, delete an account, etc. functional requirements are detailed and are specified in the system design

Non-functional requirement are not straight forward the requirement of the system rather it is related to usability( in some way ) for example for a banking application a major non-functional requirement will be available the application should be available 24/7 with no downtime if possible.

I think functional requirement is from client to developer side that is regarding functionality to the user by the software and non-functional requirement is from developer to client i.e. the requirement is not given by client but it is provided by developer to run the system smoothly e.g. safety, security, flexibility, scalability, availability, etc.

FUNCTIONAL REQUIREMENTS the activities the system must perform

• business uses functions the users carry out
• use cases example if you are developing a payroll system required functions
• generate electronic fund transfers
• calculation commission amounts
• calculate payroll taxes
• report tax deduction to the IRS