Browse Definitions :
Definition

functional requirements

Contributor(s): Matthew Haughn

Functional requirements are the desired operations of a program, or system as defined in software development and systems engineering. The systems in systems engineering can be either software electronic hardware or combination software-driven electronics.

Functional requirements are a part of requirements analysis (also known as requirements engineering), which is an interdisciplinary field of engineering that concerns the design and maintenance of complex systems. Functional requirements describe the desired end function of a system operating within normal parameters, so as to assure the design is adequate to make the desired product and the end product reaches its potential of the design in order to meet user expectations.

The requirements in requirement engineering help direct the development of the engineered product. Typically, a functional requirement is a basic functionality or desired behavior documented clearly and quantitatively. Requirements engineering ideas may be applied to more or less complex items. For example, when outlining the functional requirements for a jar, a functional requirement would be that it holds a fluid and have a threaded top for a lid to seal the jam for better preservation. When a product fails functional requirements, it usually means the product is of low quality and possibly entirely useless.

Functional requirements in systems engineering are complemented by technical requirements, which are also known as non-functional requirements. Technical requirements define what is required to deliver the desired function or behavior from a system to a user’s standards. Technical requirements can be performance factors, accessibility, versatility, logging, control and  backup.

Functional requirements may be considered met even when the non-functional requirements are not. This can still mean that the product is unusable, such as in the consideration of performance requirements.

This was last updated in May 2018

Continue Reading About functional requirements

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

  • compliance audit

    A compliance audit is a comprehensive review of an organization's adherence to regulatory guidelines.

  • regulatory compliance

    Regulatory compliance is an organization's adherence to laws, regulations, guidelines and specifications relevant to its business...

  • Whistleblower Protection Act

    The Whistleblower Protection Act of 1989 is a law that protects federal government employees in the United States from ...

SearchSecurity

  • payload (computing)

    In computing, a payload is the carrying capacity of a packet or other transmission data unit. The term has its roots in the ...

  • passphrase

    A passphrase is a string of characters longer than the usual password (which is typically from four to 16 characters long) that ...

  • Web application firewall (WAF)

    A Web application firewall (WAF) is a firewall that monitors, filters or blocks traffic to and from a Web application. WAFs are ...

SearchHealthIT

SearchDisasterRecovery

SearchStorage

  • computational storage

    Computational storage is defined as an architecture that couples compute with storage in order to reduce data movement. In doing ...

  • data deduplication

    Data deduplication -- often called intelligent compression or single-instance storage -- is a process that eliminates redundant ...

  • public cloud storage

    Public cloud storage, also called storage-as-a-service or online storage is a service model that provides data storage on a ...

Close