What is Non-Functional Requirements?

Aspects of availability that need to be considered during elicitation include—but are not limited to periods during which availability is essential to achieve business objectives, the effects of a system's downtime, scheduled maintenance windows, and notifications during a system outage.

Interoperability/Compatibility

The level of interoperability indicates how well the solution works with other parts. It is a gauge of how well the system works with other software programmers and how simple it is to interact with other hardware.

Performance

Performance is the degree to which a solution or a part of it carries out its functions while using the fewest resources possible. Due to its significant design consequences and influence on hardware device selection, it is a significant quality attribute.

Reliability

A solution or one of its components must be reliable to carry out its intended functions under predetermined circumstances for a predetermined amount of time.

Reliability may be defined by the average number of cycles a system runs before failing, the percentage of successfully performed operations over time, the maximum allowable failure probability, or the total number of failures over time.

During elicitation, reliability-related topics will be covered, including but not limited to the evaluation of the system as reliable, reliability categorization that distinguishes between occasional failures and regular failures, and the effect of failure on business activities.

Usability

Usability refers to how easily a user can pick up utilizing the solution and how easily he or she can use the system. Usability encompasses a variety of factors in addition to ease of learning and usage, such as memory ease, error avoidance & handling, and accessibility, among others.

The number of human-system touchpoints necessary to complete a task, the average time required to complete a task, the average number of errors made during task completion, the average number of attempts before a task is completed, and other factors related to usability will all be discussed during the elicitation process.

Maintainability/Modifiability

The term "maintenance-friendliness" describes how easily a solution or part of it may be mended, improved to suit business needs, boost productivity, or adjusted to a changing environment.

It represents how simple it is to comprehend, modify, and extend the software architecture and code. Maintainability is crucial for systems that must be routinely modified or improved. The percentage of patches made right the first time, the percentage of changes deployed correctly the first time, and the typical amount of time needed to repair a problem correctly are among the maintainability aspects to be reviewed during elicitation.

Portability

The capacity to move a system or one of its components from one operating environment to another is known as portability. Its significance has grown over time as a result of the need for apps to function across several environments, including Windows, Mac, and Linux, as well as mobile operating systems like Android and iOS.

During elicitation, portability issues will be raised concerning, but not limited to, various platforms on which the system must run, system components, and/or data pieces that must be explicitly developed for greater portability.

Scalability

Scalability is a term used to describe how well a solution can change over time to accommodate growing workloads. The user base, transactions, data, network traffic, or other reasons may have increased the workload.

The system should be able to scale up, which may entail adding more servers, faster processors, more disc space, or more network capacity to the hardware or utilizing software-specific techniques like data compression, code and performance optimization, and other similar methods.

Reusability

The ability of software or a software component to be reused in various applications is referred to as reusability. Which system elements/components should be developed in a way that enables their reuse across different applications must be defined?

Aspects of reuse that will be discussed during elicitation include but are not limited to functionality or artifacts from other applications that can be used across applications that are being built, as well as functionality or artifacts from the application that is being built that can be used across other applications, either current or future.

Importance Non-Functional Requirements

Non-functional requirements are significant because they can make or break the success of a software system or a product. Even when a system satisfies all expected functional criteria but fails to produce the desired quality results, users will not hesitate to reject it outright.

Conclusion

Users frequently expect how well a software system should function in terms of availability, usability, speed of functional execution, the likelihood of failure, security against unauthorized access, and effectiveness in handling unforeseen circumstances when they do arise.