This paper discusses stylistic conventions within broad disciplinary g
roupings in the language of doctoral theses. It argues that the langua
ge conventions in doctoral thesis texts reflect spohisticated learning
of key disciplinary norms governing the conception, production and re
porting of knowledge in particular fields. The paper shows that many c
onventions are subtle; they may not be readily identifiable to experie
nced scholars, yet doctoral students are expected to learn and master
them, suggesting that discipline-specific writing norms and convention
s are learned largely by tacit means during doctoral study. The paper
reviews the nature of linguistic forms in doctoral theses and identifi
es the underlying epistemological and cultural influences which shape
the writing. Doctoral theses from a range of disciplines are examined
closely. Attention particularly is directed to the overall structure o
f argument and the techniques for coherence; the conventions for citin
g, acknowledging and making judgements about previous research; and th
e nature of the technical language of the field.