The author attempts to answer the question in the title by drawing on
his experience in teaching a thesis colloquium, part of a series of co
urses at the University at Buffalo that prepares graduate planning stu
dents for work on their theses. In search of a definition the author c
ompares the rhetorical features of the traditional thesis to those of
other kinds of culminating master's degree exercises, namely the essay
, project, and evocative presentation. He then suggests that scholarly
articles written for professional audiences can serve as good models
for the traditional thesis. This paper presents a list of questions fo
r guiding the critical reading of these model articles.