The capability to successfully perform a task is known as?

The term that best captures the capability to successfully perform a task is 'competence.' This concept embodies not only an individual's knowledge or understanding of a task but also their ability to apply that knowledge effectively to achieve desired outcomes. Competence reflects a combination of skills, experience, and the application of those in practical situations.

While proficiency and skill are closely related terms, they generally refer to the level of expertise or mastery in executing a task. Proficiency indicates a high degree of competence, whereas skill tends to denote an ability to perform specific tasks effectively. Achievement, on the other hand, relates to the outcomes or results of performance, rather than the inherent ability to perform the task itself. Thus, competence encompasses a broader aspect of being able to execute a task with the necessary knowledge, skills, and confidence.