How can I change the spacing in my LaTeX document?

To double space a LaTeX document, you should include the line

        \usepackage{setspace}

after your \documentclass line.

Before your \begin{document} command,

	\doublespacing

will make the text of the whole document double spaced. Footnotes, figures, and tables will still be singlespaced, however. For one-and-a-half spacing, instead use the command

	\onehalfspacing

In order to make a part of the text of your document singlespaced, you can put:

	\begin{singlespace}

at the beginning of the text you want singlespaced, and

	\end{singlespace}

at the end.

You can also set the spacing to be something other than doublespaced; for
example, if you wanted to have one-and-a-quarter spacing between lines,
use the line

	\setstretch{1.25}

before your \begin{document} command, and after the \usepackage{setspace} line.

There is another package, called "doublespace" which will usually work exactly the same way as setspace. However, it interacts poorly with some graphics packages.