摘要：If, in the context of a survey, one wishes to knowhow old a participant is, one question suffices: “Howold are you?” The same applies if one is interested inparticipants’ alcohol use per day, or whether the personis married or not. The use of a single item to measureconstructs is also common practice in disparate fieldssuch as job satisfaction ,1 stress research ,2 or happinessstudies .3 In fact, how many different ways are there toask how happy a person is?
