reikalavim

Reikalavimas (plural reikalavimai) is a statement that defines conditions, capabilities, or outcomes that must be met by a product, service, process, or project. It specifies what should be achieved and can include constraints or criteria that guide design, development, and evaluation. Reikalavimai can be functional, describing specific behaviors or functions, or non-functional, covering quality attributes such as performance, reliability, security, and usability. They may be imposed by external authorities, standards, or contractual requirements, or defined by stakeholders within an organization.

In practice, management of reikalavimai involves elicitation, analysis, documentation, validation, and change management. Requirements engineering is the discipline that focuses on discovering and specifying these criteria in a clear, verifiable form. Reikalavimai are typically organized into documents or specifications and are tied to designs, implementations, and tests through traceability. In software engineering, they drive development and testing; in contracts, they define deliverables and acceptance criteria; in manufacturing and service sectors, they set product specs and quality checks.

Linguistically, the concept stems from the Lithuanian verb reikalauti, meaning to demand or require. The base forms are reikalavimas (singular) and reikalavimai (plural); reikalavim appears in inflected forms within sentences. The notion is widely used in standards, regulatory compliance, and quality frameworks, such as ISO 9001, where clear requirements underpin conformity and continuous improvement.