Ilmaisuvaatimuksilla

Ilmaisuvaatimuksilla, often translated as "expression requirements" or "declarative requirements," refers to a set of specifications that describe what a system or software should do without detailing how it should be implemented. This approach focuses on the desired outcomes and functionalities from a user or stakeholder perspective. Instead of prescribing specific algorithms or data structures, it outlines the expected behavior, constraints, and qualities of the system.

The core principle behind ilmaisuvaatimuksilla is to separate the *what* from the *how*. This allows for greater flexibility in design and implementation, as developers can choose the most efficient or appropriate technical solutions to meet the stated requirements. It also facilitates better communication between non-technical stakeholders and development teams, as the language used is generally more accessible and less prone to misinterpretation than highly technical specifications.

In practice, ilmaisuvaatimuksilla can be expressed using various methods, including natural language, use cases, user stories, or formal specification languages. The key is that the requirements clearly define the intended purpose and observable behavior of the system. This contrasts with prescriptive requirements, which often dictate specific implementation details. By focusing on the expressive nature of the desired system, ilmaisuvaatimuksilla aims to ensure that the final product effectively addresses the needs it was designed to fulfill.