Doctoral work is recognizable across disciplines because the underlying form is invariant — even though the vocabulary, methods, and conventions vary widely. This file extends §10 of the synthesis with Andrew Maynard’s particular stance: legitimate doctoral work can transcend disciplinary categorization entirely, and some of the strongest work happens in the seams between fields. Consult when a user’s work doesn’t fit a single discipline, when they wonder whether interdisciplinary or transdisciplinary work is “really” a PhD, or when they are testing what it means to do scholarship that crosses boundaries.
The work that I think matters most sometimes doesn’t sit cleanly inside a single discipline. That is awkward for the doctorate, because doctoral standards have historically been set by particular fields, and a student working between or beyond fields has to build their standards as they go. This file is about what that looks like, why it can be legitimate doctoral work, and what makes it hard.
The synthesis names the invariants of doctoral work — the architecture of scholarship, the requirements of rigor, the discipline of argument, the posture of the researcher — and shows how they take different forms across philosophy, qualitative and quantitative social science, mixed methods, natural sciences, engineering, computational fields, and practice-based work. Different forms; same shape. This file extends that in one direction the synthesis only gestures at: doctoral work that does not fit a single discipline at all.
My view — and I am still not sure how defensible all of it is, because I am still learning and growing — is that someone should be able to do a PhD on the basis of strong scholarship that does not sit cleanly inside any one disciplinary mold. The conventional name for this is transdisciplinary, and that is the term I lean on most of the time. (I sometimes call it undisciplinary and call myself an undisciplinarian — tongue in cheek, mostly, but with a serious point underneath.) This is something I actively work toward with my own students. I have students who claim, themselves, to work this way: across or between disciplines, drawing on more than one tradition, producing work that other scholars recognize as valuable and robust without being recognizable as belonging to any single field.
Transdisciplinary doctoral work is challenging in a way that work within a single discipline is not. The student is doing the doctorate without the scaffolding that disciplinary norms provide; the standards have to be re-derived from the underlying invariants rather than borrowed from the field’s existing playbook. That re-deriving is itself part of the scholarly work. It requires a particular kind of reflexivity — the constant interrogation of one’s own choices, framings, and warrants — at every step.
A few things are worth getting straight in this territory, because the conventional framings often miss them.
Interdisciplinary and transdisciplinary work is not the same as mixed methods. The synthesis groups them together loosely, but they are different things. Mixed methods refers to the integration of (typically) quantitative and qualitative methods within a recognized methodological tradition. Interdisciplinary and transdisciplinary work crosses or transcends disciplinary frames altogether. A user working across fields should not assume that mixed-methods guidance applies to them.
The invariants do not relax under any of this. A student doing transdisciplinary work still has to satisfy the underlying standards — a defensible question, a defensible approach, evidence handled with care, claims warranted, alternatives engaged, limits named, contribution articulated. The vocabulary and conventions may not be borrowed wholesale from any single discipline, but the requirements are not.
That respect for the invariants extends, in turn, to the disciplines themselves. Working across or beyond disciplines is not the same as ignoring them. Strong transdisciplinary work draws on its constituent fields with understanding, even where it then departs from them. The student who treats disciplinary norms as constraints to be ignored has misunderstood the move; the student who treats them as scaffolding to be tested, extended, or selectively departed from has not.
And — this is the positive claim, the reason I work toward this with my own students — the work that matters most often lives in the seams. The questions that move things forward often sit between disciplines rather than within them. A student whose instinct is to look at a problem from multiple angles at once, and to draw on whatever traditions help, is doing something the academy has historically squeezed into a particular field. It does not have to be squeezed.
The honest caveat here is that this is challenging territory, both for the student and for their chair, and the standards are still being worked out as the academy slowly adjusts to a world where the most interesting questions cross the lines that built it. A student doing this kind of work should expect to spend more time defending their choices than a student working within an established field, and should expect to be reflexive at every step about what they are doing and why.
A user asking can I do a PhD on something that doesn’t fit a discipline? deserves an honest answer: yes, but with eyes open, and with the particular discipline of self-interrogation that the work itself requires.