\begin{frame}
  \frametitle{Summary}
  
  \begin{goal}{Why Database Management Systems?}
    \begin{itemize}
      \item \emph{data independence}
      \begin{itemize}
        \item logical view on the data independent of physical storage
      \end{itemize}
      \item \emph{avoidance of duplication}
        \begin{itemize}
          \item different views on the same database
        \end{itemize}
      \item high-level \emph{declarative query languages} (what, not how)
      \begin{itemize}
%         \item query tells what you want, independent of storage structure 
        \item efficient data access, automatic query optimisation
      \end{itemize}
      \item \emph{data models} \& \emph{data integrity (consistency)}
      \item multiple users, \emph{concurrent access}
        \begin{itemize}
          \item transactions with ACID properties
        \end{itemize}
      \item \emph{persistent storage}, \emph{safety} and \emph{high availability}
        \begin{itemize}
          \item safety against failure (backup/restore)
        \end{itemize}
      \item \emph{scalability} (data could by much larger than main memory)
        \begin{itemize}
          \item indexing, scalable algorithms
        \end{itemize}
      \item \emph{security} (user permission management)
    \end{itemize}
    
  \end{goal}
\end{frame}