 Four DCE-Q questionnaire addenda will be developed in addition to the preceding information on MAR with AGs. First, to clarify the DCE method, the DCE-Q will be preceded by detailed instructions. Couples and physicians will be explained that from each choice set they need to select the hypothetical fertility treatment which they prefer. An example choice set, where respondents have to select their preferred airline ticket for a holiday will be exemplifying. Second, a form to collect demographic characteristics and professional characteristics or medical characteristics, for physicians or couples, respectively will be developed. Third, to test the face-validity of the modelled treatment characteristics, respondents will be asked for any additional treatment characteristics on which they would have liked to be informed to choose between fertility treatments. Fourth and only applicable to couples, not to physicians, couples actual past choice behaviour will be examined by asking them which fertility treatments they have opted for, and for which reasons they decided for or against the offered treatment options. 