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#Non functional requirements drivers

Testable - NFRs must be stated with objective, measurable and testable criteria, because, if you can't test it, you can't ship it.

Is the extra effort worth an additional eight hours of uptime per year? Simple statements like "99.9999% availability" may increase effort by one or two orders of magnitude more than "99.999% availability" requires.

#Non functional requirements drivers

Negotiable - Understanding the NFRS business drivers and bounded context mandates negotiability.Independent - NFRs should be independent of each other, so that they can be evaluated and tested without consideration or impact of other system qualities.For example, performance considerations can be extremely important for the main application, but be irrelevant (or too expensive) for administration and support applications. Bounded - Some NFRs are irrelevant (or even impairing) when they lack bounded context.Properly defining NFRs requires consideration of the following criteria:

Refactoring models to better reflect increasing solution domain knowledge.Planning and building Architectural Runway analyzing prospective Architectural Features and Architectural Epics.Business Epic and Business Feature analysis.Specifically, the following activities must explicitly take NFRs into consideration: NFRs and Agile Analysisīy imposing such constraints, NFRs may impact a wide scope of system functionality and therefore, they are an important factor in Agile analysis. Some calls the NFRs as - usability reliability interoperability scalability.įailing to meet any one of the NFRs can result in systems that do not meet internal business, user or market needs, or mandatory requirements that are imposed by regulatory or standards agencies. These requirements are just as critical as the functional features and user stories, as they assure the usability and efficiency of the entire system. There can also be constraints or restrictions on the design of the system (in which they may be referred to as design constraints). These requirements cannot be counted as functional as they are around the product in a more higher level. Nonfunctional requirements or in short abreviation - NFRs, describe system attributes such as security, reliability, maintainability, scalability, and usability. Menu Testing Nonfunctional Requirements 01 October 2015 on REST API, Testing, Automated Testing, NFR What are Nonfunctional Requirements?