기존의 공동주택 시운전은 모든 가구를 직원이 직접 방문해 육안으로 점검하는 방식으로 진행, 면밀한 점검이 어려웠다.
Existing apartment house trials were conducted in a way that all households were visited by the staff and visually inspected, so it was difficult to conduct a thorough inspection.