Their polling methods must inspire widespread confidence, in other words be objective, fair and as scientific as possible. So those involved must be experts with training in social science, statistics, surveying, sampling and analysis.
換句話說，方法一定要客觀、公正、且儘量做到科學，因此參與者一定要受過社會科學、統計、調查、抽樣、分析等訓練的民意測驗專家。