How do I override the \item spacing

Question

Possible Duplicate:
Vertical space in lists

I have the following list being generated for me:

\begin{itemize}
\item
  Introduction (this chapter)
\item
  Yum and RPM in datacenter/cloud operations
\item
  RPM - Indivisible Unit
\item
  RPM - For Developers
\item
  Package Signing
\item
  Yum Configuration Management
\item
  Validation
\end{itemize}

How can I override the \itemsep and \parskip without placing it with inthe \begin{itemize}?