What are the Non Functional Requirements

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A non-functional requirement is a requirement that specifies criteria that can be used to judge the operation of a system, rather than specific behaviors.

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Non-Functional Requirements (NFRs) are the properties of a software system that sit outside of specific features and functionality that typically dictate how the system should behave. Non-Functional Requirements are the constraints or the requirements imposed on the system. They specify the quality attribute of the software.

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a non-functional requirement (NFR) is a requirement that specifies criteria that can be used to judge the operation of a system, rather than specific behaviors. The plan for implementing non-functional requirements is detailed in the system architecture, because they are usually architecturally significant requirements.
Qualities?that is non-functional requirements?can be divided into two main categories:
Execution qualities, such as safety, security and usability, which are observable during operation (at run time).
Evolution qualities, such as testability, maintainability, extensibility and scalability, which are embodied in the static structure of the system

[Siddhivinayak Salunke]

Non-Functional Requirements are the constraints or the requirements imposed on the system. They specify the quality attribute of the software. Non-Functional Requirements deal with issues like scalability, maintainability, performance, portability, security, reliability, and many more. Non-Functional Requirements address vital issues of quality for software systems. If NFRs not addressed properly, the results can include:

Users, clients, and developers are unsatisfied.
Inconsistent software.
Time and cost overrun to fix the software which was prepared without keeping NFRs in mind.

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The end goal of a project is to deliver a high quality product exactly as the customer asked for. Functional requirements are the primary way that a customer communicates their requirements to the project team. Functional requirements help to keep project team going in the right direction.

Unclear requirements leads to a poorly defined scope that creates a lot of challenges from the beginning of the project. A poorly defined scope leads to extension in the schedule and increase in cost. The customer may not have the time and money to invest, so they just accept a product with low quality.

Typically, the customer has both needs and wants. After seeing the cost estimate, they may ask to reduce the scope. Usually removing some of the non-functional requirements reduces the scope. A lot of non-functional requirements can quickly drive up the cost, while insufficient non-functional

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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.
Example:
1.Scalability.
2.Capacity.
3.Availability.
4.Reliability.
5.Recoverability.
6.Maintainability.
7.Serviceability.
8.Performance.

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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.

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Non-Functional Requirement (NFR) specifies the quality attributes of software system. NFR is based on Responsiveness, Usability, Security, Portability and other non-functional standards that are critical to the success of the software system. For example- Website loading speed is slow.

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A non-functional requirement is a requirement that specifies criteria that can be used to judge the operation of a system, rather than specific behaviors. They are contrasted with functional requirements that define specific behavior or functions.

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Non Functional requirements is a constraints which affect how the system should do it.
Examples:
Security
Capacity
Compatibility
Reliability and availability
Maintainability
Manageability
Scalability
Usability
Performance
Regulatory

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Non functional requirements (SSD) are related to quality, reliability, system environment, regulatory, standards etc and supports functional requirements

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Here are some example to better understand it:

Usability
Security
Maintainability
Scalability
Reliability
Efficiency
Compatibility
Robustness

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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?

?It's? don?t cover all types, however.

 

Other Common Types of Non-Functional Requirements
Performance ? How quickly does the system respond to users? actions, or how long does a user wait for a specific operation to happen?

Regulatory ? Are there requirements you need to satisfy for compliance?

Environmental ? What types of environments will the system be expected to perform within?

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The definition of a non-functional requirement is: Any requirement that specifies how the system performs a certain function other words, a non-functional requirement will describe how a system should behave and what limits there are on its functionality.
The importance of non-functional requirements stems from the fact that they can make or break the success of a software system or a product. Users will not hesitate to outrightly reject a system even if it meets all expected functional requirements but fail to deliver the required quality outcomes.

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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).