\begin{frame}
  Since I may want to focus on one item at a time in my presentation,
  \begin{itemize}
  \item I want to reveal only the first item on my list initially,
  \pause
  \item then the second item,
  \pause
  \item then the third,
  \pause
  \item and so on...
  \end{itemize}
  \end{frame}