Interdisciplinary research collaboration(IRC), reflected in 3,184 response of 1997 survey in Korea, is very common. IRC within same disciplines is 60%, and IRC with other disciplines is 40%. IRC with Humanities and Social Science is 11%. Policy expectations for interdisciplinary collaboration are very different depending on disciplines. The difference between disciplines and fields such as Natural Science, Life Science and Engineering is quite noticeable. Policies for interdisciplinary research collaboration are recommended to reflect the different tendencies between disciplines, at least between fields.