What term refers to being successful at producing or obtaining an intended result?

The term that signifies being successful at producing or obtaining an intended result is "effective." Effectiveness focuses on the outcome and the extent to which a goal has been achieved. In many contexts, being effective means that the intended result has been realized, regardless of the resources or time taken to do so.

For instance, in healthcare or caregiving, an effective intervention is one that successfully improves a patient’s condition or achieves the desired health outcome, showcasing its direct impact on achieving specific goals. While efficiency relates to the use of resources and how well those resources are utilized to achieve a result, effectiveness is strictly about the end result itself.

The other terms, such as proficient and capable, refer to the skills or abilities of a person to perform tasks rather than the outcomes of those tasks. Proficient means skilled or competent in a particular area or activity, while capable refers to the potential or ability to perform a task, but does not inherently include the concept of achieving a specific desired outcome.