Guides · Updated 2026-11-15
Dissertation defense questions by field
How committees in different disciplines pressure a dissertation, and the questions that travel across fields.
The shared core
A historian, a biologist, and a computer scientist do not ask the same question in the same words. They do ask the same kind of question: is the evidence the kind of evidence this claim requires? Field-specific practice starts after you can answer that without hiding inside vocabulary.
Use your field's standard of proof on purpose. Name it. A committee relaxes when it can hear that you know what would count against you inside the discipline, not only what would count in a general methods textbook.
What each table tends to press
Lab sciences and engineering press replication, controls, measurement error, and whether a figure is doing more work than the design allows. Psychology and education press constructs, sampling, pre-registration or the lack of it, and alternative explanations for a behavioral result. Public health presses exposure definition, confounding, and whether a policy sentence is larger than the study.
History and the interpretive social sciences press source selection, periodization, and what a counter-reading of the same archive would say. Economics presses identification, the comparison group, and robustness. Computer science presses baselines, data leakage, ablations, and what happens when the stated assumption is removed. Sociology presses case logic, position of the researcher, and how far a mechanism travels.
Outside members ask the useful blunt question
The outside member is often the person who will not let a term stand in for an argument. Prepare a plain-language version of the method and of the result. If you cannot explain the design without the field's shorthand, the shorthand is covering a gap.
Pick the two fields adjacent to yours and write the question you hope they will not ask. That question belongs in the mock defense, not in a footnote you add the night before.
MockCommittee will not draft, rewrite, or polish thesis or dissertation prose for you to submit. A stronger answer is a spoken reply you can study aloud. Putting it into the document is academic misconduct.