An important aspect of supervision is which attempts to insure that the interviewers are strictly following the sampling plan rather than selecting sampling units based on convenience or accessibility.

sampling control.

Explanation:

According to my research on different leadership requirements, I can say that based on the information provided within the question an important aspect of supervision is sampling control. In other words (like mentioned in the question) this is the process of controlling employees to make sure they are following the process/plan correctly instead of working in a way that is more convenient for them.

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