The quality/ability/extent of being effective.
Effectiveness is a system quality attribute or non-functional requirement that is described as the capability of a system to perform tasks efficiently and accurately, achieving the intended goals or objectives.
Effectiveness is a crucial system quality attribute, as it measures the success of a system in delivering its intended functionality while satisfying user needs and business requirements. The effectiveness of a system is often measured through performance metrics, such as transaction throughput, response time, error rate, and completion rate.
In addition to being a system quality attribute, effectiveness is often considered as a cross-functional constraint, as it is closely related to other quality attributes such as usability, reliability, and security. A system that is not effective in performing its tasks may also suffer from poor usability, unreliable performance, and security vulnerabilities.
Define effective: Effective means that a computer or software system performs the tasks it was designed for efficiently and successfully achieves the intended outcome. It is a reflection of how well a tool or technology can achieve its goals while minimizing errors, bugs, and inefficiencies. An effective computer or software system provides users with a positive user experience, is user-friendly and easy to navigate, and is generally reliable in its performance.
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Dictionary: effective: adequate to accomplish a purpose; producing the intended or expected result. actually in operation or in force; functioning.