Mastery refers to what level of skill performance?

Mastery indicates the highest level of skill performance. At this level, an individual demonstrates an in-depth understanding and the ability to execute tasks proficiently and consistently without errors. Mastery reflects not only the capability to perform a skill competently but also the insight to adapt and manage unexpected challenges effectively.

In contrast, the other options suggest varying degrees of proficiency that do not reach the pinnacle defined by mastery. A basic understanding indicates foundational knowledge, while performance under supervision implies a dependence on guidance, neither of which encompasses the autonomy and expertise that mastery entails. Competent performance under stress reflects capability but does not necessarily capture the comprehensive skill level that mastery requires.