One main challenge of which type of requirements is the language being used?

• A. Functional
• B. Performance
• C. Structural
• D. Aesthetic

Answer: (B)

Performance requirements are about how well a system must perform under defined conditions. The language in these requirements is tricky because it must be precise, measurable, and verifiable. Without numeric targets and clear test methods, terms like “fast,” “smooth,” or “efficient” can be interpreted differently by owners, designers, and builders, leading to misunderstandings or disputes. To make them actionable, you specify exact metrics (for example, response time in seconds under a given load, maximum power use, uptime percentage), the expected workload and environment, and how acceptance will be tested. This need for quantifiable, testable language is what makes the wording of performance requirements particularly challenging. Functional requirements describe what the system should do, structural deals with physical composition, and aesthetic with appearance, but they don’t hinge on measurable, verifiable performance under load in the same way.