Define Functional & Non-Functional Software Requirement

Define Functional & Non-Functional Software Requirement in SDLC to develop a computerized System.

System Development Life Cycle is a stepwise process of creating computer systems. It is the conceptual model which represents the necessary steps used for the development process of a software system.

SDLC serves as a guide to the project and provides a flexible and consistent medium to accommodate changes, and perform the project to meet the client’s objectives. SDLC phases define the key schedule and delivery points which ensure timely and correct delivery of software to the client within budget and other constraints and project requirements. SDLC co-operates project control and management activities as they must be introduced within each phase of SDLC. 

SDLC is important because it breaks down the entire life cycle of software development into phases thus making it easier for the development team members to easily evaluate each part of software development. 

SDLC makes it easy for programmers to work concurrently o each phase.  It provides a rough time estimate that when the software will be available for the user. It delivers quality software which meets or exceeds customer expectations. 

SDLC helps the project manager to establish a project management structure. SDLC clearly defines and assigns the roles and responsibilities of all the involved peoples. SDLC serves as a guide to the project and provides a flexible and consistent medium to accommodate changes, and perform the project to meet the client’s objectives.

Requirement Engineering & Collecting:

The process of gathering the software requirements from the client, analyze and document them is known as Requirement engineeringThe goal of requirement engineering is to develop and maintain a document that defines the functionality of the developed system in all aspect. 

The Requirement Engineering & Requirement Collecting phase actually defines all the components of software. In this phase the question “How the developed software looks like and what function it will do?” is answered.

difference between functional & non-functional software requirement in SDLC

Software Requirements: 

Software requirement refers to the needs of stakeholders that are to be solved by software. Software requirements mean all those qualities and functions which a customer need in the newly developed software. 

Software requirement describes all the functions of the software. Without knowing software requirement, a quality software cannot be developed. Broadly software requirement is categorized into two categories.

Functional Requirements:

The official definition of a functional requirement is that it essentially specifies something the system should do. Requirements, which are related to a functional aspect of software fall into this category. They define functions and functionality within and from the software system.  

Examples of functional requirements:

  • The search option is given to a user to search from various invoices.
  • A user should be able to mail any report to management. 
  • Users can be divided into groups and groups can be given separate rights. 
  • Should comply with business rules and administrative functions. 
  • The software is developed keeping downward compatibility intact.

Non-Functional Requirements:

The definition for a non-functional requirement is that it essentially specifies how the system should work. Requirements, which are not related to a functional aspect of software, fall into this category. 

Non-functional requirements are implicit or expected characteristics of software and Non-Functional Requirement include following terms to be pointed, they are Security, Logging, Storage, Configuration, Performance, Cost Interoperability, Accessibility.


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