"Multidisciplinary" means two different disciplines side-by-side. You could be a computer programmer and also a salesman, for example. "Transdisciplinary" or "interdiscipinary" means combining tools without regard for disciplinary boundaries. If you've ever read The Lean Startup you can see how computing and sales might be combined into one problem-solving method as opposed to being two separate functions that just happen to be done by one person.

The key to the latter is to have an interesting problem to solve and then look for methods, rather than starting with a couple of methods and then looking for a problem. So my advice to you is, figure out what problem or opportunity you want to work on. Then look for tools in any discipline that will help you.