What are the Non Functional Requirements

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Non Functional Requirements, which determine about the characteristics of non-behavioral operations that are unable to operate the functionalities by using user interface such as Security, Reliability, Availability, Maintainability, Supportability, Performance. They serve as constraints on the design of the system across different backlogs

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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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This describes the attributes a system or process should possess and not a function that system must perform. The documents that are prepared for non-functional requirements are known as Supplementary Support Document (SSD).
In short, non-functional requirements can be described as non-technical requirement such as speed, accuracy, response time.

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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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Non-functional requirements are traditionally the requirements that are more difficult to define, measure, test, and track. In many cases this can lead to teams using only functional requirements or having to constantly evaluate their non-functional requirements for correctness. We can view non-functional requirements then, as the set of requirements that define the ?HOW SHOULD IT BE? aspects of your system.

For example: All help text, in-application and documentation, will be provided in English, French, and Spanish.

When defining purposeful non-functional requirements (NFR?s), teams should begin by defining their non-functional requirements for a wide variety of system attributes. These attributes are categorized within three following aspects of a system:

Operational NFR?s
Revisional NFR?s
Transitional NFR?s

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Nonfunctional requirements are not the behavior of the required solutions. nonfunctional requirements can be described as  non tech requirements.
Ex: page loading, themes, Fonts,  Browsers, security.

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Non-functional requirement don?t directly relate to the behavior or
functionality of the solution but rather describes environmental conditions
under which the solution must remain effective like capacity, speed, security.

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Non functional requirements are those which captures the conditions that do not directly relate to the behavior or the functionality of the solution. These mainly include the speed, security, availability. These are also called as supplementary solution.

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usability: The usability of a software or application should be user friendly, where the portability of a screen and login pages , etc., should be easy to understand for the end users, users will also start to explore about the performance or usability of a system for example if the system is running an application and alternatively the user needs to open another system at that time the system performance will be accessed, at that time performance shouldn?t slowdown even though one application is running on the back ground.
Reliability: Reliability is the one requirement to some extent how users can rely on the solution to be accessible and work what needed. It show how frequently the system shows critical failures.
Performance: The performance is nothing but the execution of the system how fast the system shows the output of a user requirement, like loading of new page, payment execution time, buffering period
Security: It is a non functional requirement which the end user does not know about it but it is very essential requirement of how the system and the data is protected from the hackers and other cyber crime people, etc.,   
Compatibility: compatibility defines how the system will adapt with another and third party system with  the same environment and work together with progress of a project
Data Integrity: It is critical approach of to implement of usage of system which gathers ,saves, and recover data.it will be consistent and accuracy.

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Non Fictional Requirement refer to needs that must be fulfilled related to things like user interface, access security, availability, system failure, integration and migration. They do not deal with actual functionality of the system but represent key project success factors.

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Non-functional requirements specify how a system should perform a function, including the constraints and minimum requirements. Non-functional requirements are the quality attributes of the system which includes performance, reliability, recover-ability, security, data integrity and usability.
The main elements of the non-functional requirements analysis are,
?   Availability - A degree to which the solution is operable and accessible when required for use.
?   Compatibility - A degree to which the solution operates effectively with other components in its environment.
?   Functionality - A degree to which the solutions functions meet the users needs, including the aspects of accuracy and suitability.
?   Maintainability - With which a solution can be modified to correct the fault and improve the performance.
?   Performance Efficiency - A degree to which a solution performs its designated functions with minimum consumption of resources.
?   Portability - With which a solution can be transferred from one environment to another.
?   Reliability - Ability of the solution to perform its required functions under stated conditions for a specified period of time.
?   Security - That protect the solution content or the solution components from malicious access or the destruction.
?   Usability - With which a user can learn to use the solution.
?   Certification - Constraints on the solution that are necessary to meet the certain standards.
?   Localization - Requirements dealing with local languages, cultures, laws, and other characteristics of the users, which require attention to the context.
?   Service Level Agreements - Constraints of the organization being served by the solution that are formally agreed by both the provider and the user of the solution.
?   Extensible - The ability of the solution to incorporate new functionality.

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Non-functional requirements are the criteria for evaluating how a software system should perform and a software system must have certain quality attributes in order to meet non-functional requirements. So when we say a system should be "secure", "highly-available", "portable", "scalable" and so on, we are talking about its quality attributes. Other terms for non-functional requirements are "qualities", "quality goals", "quality of service requirements", "constraints", "non-behavioral requirements

[admin]

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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Non-functional Requirements serve as constraints or restrictions on the design of the system across the different backlogs. They ensure the usability and effectiveness of the entire system.
Security ? Does your product store or transmit sensitive information? Does your IT department require adherence to specific standards? What security best practices are used in your industry?
Capacity ? What are your system?s storage requirements, today and in the future? How will your system scale up for increasing volume demands?
Compatibility ? What are the minimum hardware requirements? What operating systems and their versions must be supported?
Reliability and Availability ? What is the critical failure time under normal usage? Does a user need access to this all hours of every day?
Maintainability and Manageability?How much time does it take to fix components, and how easily can an administrator manage the system?
Scalability ? What are the highest workloads under which the system will still perform as expected?
Usability ? How easy is it to use the product?

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Types of Non-Functional Requirements
There are many common categories of non functional requirements.

NFRs are often thought of as the ?itys.? While the specifics will vary between products, having a list of these NFR types defined up front provides a handy checklist to make sure you?re not missing critical requirements.

This is not an exhaustive list, but here?s what we mean: 

NFR ?Itys?
Security ? Does your product store or transmit sensitive information? Does your IT department require adherence to specific standards? What security best practices are used in your industry?

Capacity ? What are your system?s storage requirements, today and in the future? How will your system scale up for increasing volume demands?

Compatibility ? What are the minimum hardware requirements? What operating systems and their versions must be supported?

Reliability and Availability ? What is the critical failure time under normal usage? Does a user need access to this all hours of every day?

Maintainability  + Manageability?How much time does it take to fix components, and how easily can an administrator manage the system? Under this umbrella, you could also define Recoverability and Serviceability.

Scalability ? The Black Friday test. What are the highest workloads under which the system will still perform as expected?

Usability ? How easy is it to use the product? What defines the experience of using the product?