Interdisciplinarity: easy but hard; hard but easy.
In some ways the concept of interdisciplinarity is easy: when doing research or when learning, follow the problem, not ‘the subject’. That is (on one view) ‘interdisciplinary research’ or ‘interdisciplinary learning’. Karl Popper said it in 1963: ‘We are not students of some subject matter, but students of problems. And problems may cut right across the borders of any subject matter or discipline.’ So don’t worry about what ‘discipline’ or ‘subject’ you are meant to be doing;