Funktionsspecifika

Funktionsspecifika is a Swedish term used to describe requirements, characteristics, or specifications that are tied to a particular function within a system. The word is formed from funktions- (function) and specifika (specific), and it is commonly used in engineering, IT, and product development to distinguish behavior related to a single function from broader or cross-cutting concerns.

In requirements engineering, funktionsspecifika krav specify what a function must do—its behavior, inputs, outputs, interfaces, and constraints. They are typically documented in a funktionsspecifikation or in sectioned requirements that describe each function in detail, enabling focused design and testing.

A typical functional specification includes purpose, preconditions, primary and alternative flows, postconditions, data inputs and outputs, error handling, performance targets, reliability, security and usability considerations. It may also state acceptance criteria and methods for verification.

These function-specific requirements sit alongside non-functional or cross-functional requirements. While funktionsspecifika krav focus on the function’s behavior, non-functional requirements cover system-wide properties such as performance, maintainability, and security, and architectural constraints may influence several functions.

Examples: For a login function, funktionsspecifika krav can specify that the system accepts a username and password, enforces two-factor authentication, returns a success token within two seconds, and displays a meaningful error message after three failed attempts. For a search function, specify query support (keywords, filters), result ordering, pagination, and response time.

Benefits include improved clarity, testability, and traceability between requirements, design, and validation. Function-specific specifications are produced during requirements elicitation, reviewed with stakeholders, and maintained to reflect changes in the function’s scope.