functional requirements - definizione. Che cos'è functional requirements
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Cosa (chi) è functional requirements - definizione

REQUIREMENT THAT DEFINES THE BEHAVIOR (OUTPUT) OF A SYSTEM OR COMPONENT BASED ON INPUTS
Functional requirements

functional requirements         
<specification> What a system should be able to do, the functions it should perform. This term is used at both the user requirements analysis and software requirements specifications phases in the {software life-cycle}. An example of a non-functional requirement is an initialisation sequence incorporated into the software that is specific to a given customer. (2001-05-22)
Functional requirement         
In software engineering and systems engineering, a functional requirement defines a function of a system or its component, where a function is described as a specification of behavior between inputs and outputs.
Non-functional requirements framework         
Non-Functional Requirements framework (NFR); Non-Functional Requirements framework
NFR (Non-Functional Requirements) need a framework for compaction. The analysis begins with softgoals that represent NFR which stakeholders agree upon.

Wikipedia

Functional requirement

In software engineering and systems engineering, a functional requirement defines a function of a system or its component, where a function is described as a specification of behavior between inputs and outputs.

Functional requirements may involve calculations, technical details, data manipulation and processing, and other specific functionality that define what a system is supposed to accomplish. Behavioral requirements describe all the cases where the system uses the functional requirements, these are captured in use cases. Functional requirements are supported by non-functional requirements (also known as "quality requirements"), which impose constraints on the design or implementation (such as performance requirements, security, or reliability). Generally, functional requirements are expressed in the form "system must do <requirement>," while non-functional requirements take the form "system shall be <requirement>." The plan for implementing functional requirements is detailed in the system design, whereas non-functional requirements are detailed in the system architecture.

As defined in requirements engineering, functional requirements specify particular results of a system. This should be contrasted with non-functional requirements, which specify overall characteristics such as cost and reliability. Functional requirements drive the application architecture of a system, while non-functional requirements drive the technical architecture of a system.

In some cases a requirements analyst generates use cases after gathering and validating a set of functional requirements. The hierarchy of functional requirements collection and change, broadly speaking, is: user/stakeholder request → analyze → use case → incorporate. Stakeholders make a request; systems engineers attempt to discuss, observe, and understand the aspects of the requirement; use cases, entity relationship diagrams, and other models are built to validate the requirement; and, if documented and approved, the requirement is implemented/incorporated. Each use case illustrates behavioral 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.

Esempi dal corpus di testo per functional requirements
1. Unfortunately, many companies face serious difficulties and need to recognise that they must align talent contribution to the functional requirements of the role.
2. In terms of infrastructure establishment the GOSS shall propose to take up the development and prioritize the most functional requirements such as Security, Road Construction, Healthy Facilities, Media Communication, Electricity/power transmission, and Education.
3. Hiring criteria need to be viewed from the functional requirements of the role and aligning the individuals experience and future contribution to the business, irrespective of whether or not they have specific industry experience.
4. By Gatluak Gatdet× Jan 21, 2006 Not everything shall be termed as priorities for southern Sudan its development even though Southern Sudan start at zero level, functional and non–functional requirements must be lay out and identify for normal and rapid operation for the development.