Nefunkciniai

Nefunkciniai is the Lithuanian adjective meaning nonfunctional. It is used to describe attributes, components, or requirements that do not directly execute a system's core functions but influence quality, constraints, or behavior. In engineering and information technology, nefunkciniai is commonly used in the phrase nefunkciniai reikalavimai (nonfunctional requirements), which complement functional requirements that specify what a system must do.

Typical nefunkciniai reikalavimai cover aspects such as performance, reliability, availability, scalability, security, maintainability, usability, accessibility, portability, and compatibility. They define limits or constraints on how the system operates rather than what operations it performs. For example, a nonfunctional requirement might specify that a web service must respond to a typical request within 200 milliseconds under load, or that the system must remain available 99.9% of the time.

Nefunkciniai considerations are central to nonfunctional testing, architecture decisions, and quality assurance. They often influence choices about hardware, software architecture, programming practices, and user experience design. The term is used across domains including software development, hardware design, and systems engineering, and appears in technical documentation, project plans, and educational materials.

Etymology: formed with the prefix ne- meaning 'not' and the stem funkcin- from 'funkcija' (function), aligned with Lithuanian grammar to produce the plural masculine form nefunkciniai.

See also: functional requirement, nonfunctional requirement, quality attribute, nonfunctional testing.