Services depend on the people who provide them. as a result, their quality varies with each person's capabilities and day-to-day job performance. this element of services is referred to as

Inconsistency.

Humans aren't perfect so their services will naturally vary and not always be consistent.

This is one of the "4 i's" of service (inconsistency, intangibility, inseparability, and inventory)  or 4 elements that make services different from goods.

answerimplicit;

answer///video, because samuel can show his work in real time and be better understood;