There are three main style options:
typewriterstyle,
modernstyle, and defaultstyle.
Each is actually a specific combination of the following ``base options''.
Base options
Each of the following nine base options
controls a single aspect of the thesis' appearance.
You can use any combination of the following, e.g.,
consecutivenumbering
Changes the numbering style of figures, tables,
and equations to consecutive numbering throughout
the thesis. Otherwise (by default), figures and
tables and equations are numbered first by chapter,
then by appearance within the chapter.
You would want to use this option if you have
very few equations, figures, \emph{and} tables
in your thesis, or if they are all
concentrated in a single chapter.
inlineh4
Inlines the ``\subsubsection{}'' heading
into the beginning of the paragraph.
By default, the heading is on a separate line
and is left-justified.
nonumh4
Removes numbering from the ``\subsubsection{}''
heading. By default, the heading is numbered.
centerh1
Center the ``\section{}'' heading.
The section number, however, remains left-justified.
By default, \section headings are left-justified.
chapleft
Left-justifies ``\chapter{}'' headings.
By default: \chapter headings are centered.
chapup
Make all ``\chapter{}'' headings uppercase.
By default, the case of the heading and its label
aren't altered.
plainhead
Makes all headings use plain text.
By default, all headings use boldface text.
fixedheadsize
Makes all headings use the default text size.
By default, \chapter{} and
\section{} headings are
printed in 12-point text,
regardless what the default text size is.
emph2underline
Changes the ``\emph{...}'' command so
that it generates underlining instead of italics,
and the ``\em'' command generates a warning.
By default, both \em and \emph{}
generate boldface instead of italics.
Main options
Thesis class provides three main options
which are just special combinations of
the base options listed above.
Using one of these overrides all the base options.
typewriterstyle
This is the style given as an example in the Graduate School's
Thesis
Specifications.
There is one uniform font size, and all headings are plain.
Only chapter headings are numbered, and the text of
the chapter heading is set in uppercase letters.
Section headings are centered,
and any heading below a subsection is inlined.
It is the sum of the five base options
numberchapteronly,
emph2underline,
plainhead,
fixedheadsize, and
chapup.
modernstyle
This is a modification of the default style of
the report class.
Headings are all in boldface, and chapter,
section, and subsection headings are numbered.
Section and subsection headings are left-justified.
Subsubsection headings and below are inlined.
Lastly, the size of the chapter and section headings
aren't as large as the default in the
report class.
This option is the sum of two base options,
inlineh4 and nonumh4.
defaultstyle
This is virtually identical to modernstyle
with one exception:
subsubsections are now numbered and left-justified.
It is equivalent to no options at all, i.e.,
it enforces all the stylistic defaults.