Funktionskvalitet

Funktionskvalitet is a term used to describe the degree to which a product, system or service fulfills its intended functions in accordance with defined requirements. It focuses on how accurately, completely and reliably the functions are implemented and delivered, as well as how well they interact with other components and with users.

The concept covers several aspects of function performance, including functional correctness (the functions do what they are supposed to do), completeness (all specified functions are present), accuracy, and operational reliability. It also includes functional interoperability with other systems, adherence to safety and regulatory requirements, and the ability to perform under expected conditions. While related to broader quality, funktionskvalitet is specifically about the success of the functional behavior rather than non-functional attributes such as usability, performance, or maintainability.

Evaluation typically relies on requirements-based testing, functional testing, and acceptance testing, complemented by simulations, demonstrations, and inspections. Common metrics include defect density related to functions, functional coverage, defect escape rate, and, for systems with ongoing operation, measures such as mean time between failures and functional response consistency. Requirements traceability, design verification, and formal reviews support objective assessment of functional quality.

In practice, funktionskvalitet is shaped by design decisions, production or development processes, and evolving requirements. It is often addressed within quality management frameworks and aligned with standards that model functional quality as a component of overall product or software quality.