사전에 수집한 최고 경영자와 관련 담당자의 e-mail을 통해 설문지를 배포하고 자가보고(self-report) 형식으로 자료가 수집되었다.
The survey was distributed through the e-mails of this top management and relevant workers gathered in advance, and information was gathered within a self-report structure.