The paper discusses reasons of hightening interest in academia for interdisciplinary research. Logical and methodologic bases are put forward to delimitate multi-disciplinary, interdisciplinary and transdisciplinary research from the point of view of post-nonclassical rationality. This research permits to find out specifics of the above research types. It is concluded that specifics of interdisciplinary research result not from simple cooperation of persons laboring in varying sciences, but from synergetic efforts of scholars in differing subject matters.