What are the Non Functional Requirements

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Non Functional Requirement: As the name says, so is the meaning. When a functionality tends to be a feature of the application, the opposite being non-functional can be termed as focusing on functionality's behavior.
When every functional requirement says, "action" to be done, while every non-functional requirement defines the quality to be delivered of that functionality.
For ex: We have a functionality, "Admin should be able to view all the orders in the system"
Some non-functionality requirements samples could be,
1) Performance - In what time should the system take to load the data?
2) Usability - Is the screen usable enough for the end user?
3) Security - How secured are we in showing the customer data?

Usually, the non-functional requirements would be defined by client or in some organizations, they define a standard for themselves and follow them.

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A non-functional requirement describes a feature or trait that a business solution must have, but that is not directly related to the core business functions of the solution.

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A non-functional requirement is a specification that depicts the system’s operation capabilities and constraints which would enhance its functionality.
common types are:
Performance and scalability,
Reliability,
availability,
maintainability,
Security,
Localisation,
usability,
Portability & compatibility,

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Basically, non-functional requirements relate to qualities of the system that cut across user-facing features, such as security, reliability, and performance. Non-functional is probably a bad name because it sounds like these requirements are intangible, simply properties of a static system. However, these requirements do affect the function of the system and it is possible to design tests that these qualities are present.

The difference from functional requirements is that these qualities must be present throughout the system rather than delivered in a one-shot like a user-facing feature. Alternative terms for non-functional requirements are "constraints", "quality attributes", "quality goals" and "quality of service requirements" but let’s stick to calling them "non-functional requirements" (NFR) for now. So they have to be considered in every development cycle and factored into our test strategy.

NFR can be grouped into:

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.

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Nonfunctional Requirements define system attributes such as security, reliability, performance, maintainability, scalability, and usability. They serve as constraints or restrictions on the design of the system.

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Non-functional Requirements-They are also known as quality or supplementary requirements. These can include requirements related to capacity, speed, security, availability and the information architecture and presentation of the user interface.The result of this is a SSD/ Supplementary software Specifications Document.
Example: requirement of the peripheral used,its performance and quality etc.

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Nonfunctional Requirements (NFRs) define system attributes such as security, reliability, performance, maintainability, scalability, and usability. these describe the environmental conditions under which the solution must remain effective or qualities that the system must work

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Non - Functional requirements shows the Behaviour of the system.
Non-functional requirements are also known as quality or supplementary requirements. They capture conditions that do not directly relate to the behavior or functionality of the solution. These can include requirement related to capacity, security, speed, availability and the information architecture and presentation of the user interface. Non-functional requirements may also describe aspects of the system that don't relate to it's execution, but rather to it's evolution over time (e.g. maintainability, extensibility, documentation, etc).
 

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Nonfunctional Requirements Nonfunctional Requirements (NFRs) define system attributes such as security, reliability, performance, maintainability, scalability, and usability. They serve as constraints or restrictions on the design of the system across the different backlogs. Also known as system qualities, nonfunctional requirements are just as critical as functional Epics, Capabilities, Features, and Stories. They ensure the usability and effectiveness of the entire system. Failing to meet any one of them can result in systems that fail to satisfy internal business, user, or market needs, or that do not fulfill mandatory requirements imposed by regulatory or standards agencies.  In some cases, non-compliance can cause significant legal issues (privacy, security, safety, to name a few). NFRs are persistent qualities and constraints that, unlike functional requirements, are typically revisited as part of the Definition of Done (DoD) for each Iteration, Program Increment (PI), or release. NFRs influence all backlogs: Team, Program, Solution, and Portfolio. Proper definition and implementation of NFRs is critical. Over-specify them, and the solution may be too costly to be viable; under-specify or underachieve them, and the system will be inadequate for its intended use. An adaptive and incremental approach to exploring, defining, and implementing NFRs is a vital skill for Agile teams.

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Non-Functional requirement comes under Solution Requirement. These requirements capture the conditions that do not directly relate to the behavior or functionality of the solution, but rather describe environmental condition under which the solution must remain effective. They are also known as quality or supplementary requirements. These can include requirements related to capacity, speed, security, availability and presentation of the user interface.

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Non - Functional requirements are the conditions that do not directly relate to the behaviour of the system. They are, rather the Environmental conditions and Quality conditions under which the solution must be effective. They can include requirements related to capacity, speed, security of the system.
Example of Non - Functional Requirements: Integration of External Peripherals and the performance quality requirements.

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Non Functional requirement: these are the external peripherals that are integrated with the system.  It defines how the application interacts with the system hardware such as operating speed, accessibility, security, tack time, etc. which are look and feel requirements (intended appearance) where it shows how fast, big, accurate, safe, reliable the particular system.
Example:  At the time of payment option we get multiple-choice to do payment like cash, card, coupon, UPI. When we do online payment external peripherals that are integrated with the system like payment gateway, swipe machines, tack time, the response time of the application.

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Non Functional requirements which helps catalyse the performance of the function requirement.capacity, speed , accurate , security , reliable , which are not directly related to the behaviour of the functional requirement but improves the process by maintaining quality, security,scalability, portability , utilizability and environment.
Example : in healthcare projects consists of hypersensitive information like patient information and it has to be handled with care. if the project or organization does not complains audit team it may end up in legal issue and project cancellation also.

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Non-functional requirement  judges the operation of a system, rather than specific behaviors. In contrast to functional requirements that define specific behavior or functions.

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Non-functional Requirements: It describes the qualities of the process or system.  Instead of describing what the solution must do, the non-functional requirements describes how well the solution must do to achieve something. Non-functional requirements are described qualities of a process or system such as its repeatability, usability, reliability, interoperability, scalability, extensibility.
Mostly used Non-functional Testing Tools are:
J Meter,
Loadster,
Loadrunner,
Loadstorm,
Neoload,
Forecast,
Load Complete,
and Webserver Stress Tool.