![]() Is the system compatible with local specifics? How well are the system and its data protected against attacks? How often does the system experience critical failures? How much time does it take to fix the issue when it arises? And how is user availability time compared to downtime? Reliability, maintainability, availability. Which hardware, operating systems, and browsers, along with their versions does the software run on? Does it conflict with other applications and processes within these environments? How fast does the system return results? How much will this performance change with higher workloads? But there are quite a few types of non-functional requirements that can make it to your checklist too. The most common ones are performance, scalability, portability, compatibility, reliability, availability, maintainability, security, localization, and usability. What are the key types of non-functional requirements? Or you may have additional compliance requirements if you process payments. In some cases, this may not be relevant to you. For instance, if you intend to collect any user data and your website operates in the EU, you must meet GDPR compliance rules. And, frankly, it may differ for different products. The list of them also varies depending on the source. Nevertheless, these designations consider the same type of matter – the requirements that describe operational qualities rather than the behavior of the product. For instance, the ISO/IEC 25000 standards framework defines non-functional requirements as system quality and software quality requirements.īABOK, one of the main knowledge sources for business analysts, suggests the term non-functional requirements (NFR), which is currently the most common definition. If you’ve ever dealt with non-functional requirements, you may know that different sources and guides use different terminology. If you need a general recap on software documentation and planning, check out our video. This time we’ll focus on non-functional ones, provide examples, and explain how to approach and document them. We’ve already covered different types of software requirements as well as written a detailed post on the differences between functional and non- functional requirements. Continuing our messaging platform example, a non-functional requirement can be the speed with which a system must perform editing to satisfy user expectations, “The message must be updated for all users in a chat within 0.1 seconds, given that all users are online and have LTE connection or better.” ![]() Non-functional requirements specify the quality attributes of the system, hence their second name - quality attributes.An example of a functional requirement for a messenger will be something like, “A user must be able to edit messages after they are sent to correct errors.” (Well yeah, Meta, the system must provide this functionality. Functional requirements define what a software product must do: its features and functions.But, as you can tell from the name, they focus on different things. Functional and non-functional requirementsīoth functional and non-functional requirements describe specific characteristics that a product must have to meet the needs of the stakeholders and the business itself. These are basically the requirements that outline how well it will operate including things like speed, security, reliability, data integrity, etc. Non-functional requirements or NFRs are a set of specifications that describe the system’s operation capabilities and constraints and attempt to improve its functionality. Be it a website, a mobile, or a desktop app, it should have a set of quality attributes to meet end-user needs. Like motorcycles or any other kind of machinery, any software product has its own non-functional requirements. While these requirements don’t directly describe the vehicle’s primary function – delivering a person from point A to point B – they are still important to satisfy your needs as the driver. What features do you have in mind? Do you expect it to travel at 170 miles an hour and not to fall apart? Can you attach a sidecar to it or expand luggage space by attaching a pull-behind trailer? And let’s not forget about security systems. General recommendations for documenting non-functional requirements Reading time: 13 minutes.Reliability, Maintainability, Availability. ![]()
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