\begin{frame}
  \frametitle{Weak Entity Sets}

  \begin{quiz}{\textwidth}{Modelling with Weak Entity Sets}
    Model a set of online quizzes (multiple-choice tests).
    \begin{itemize}
      \item each quiz is identified by a title
      \item each question within a quiz is numbered
      \item each possible answer to a question is referenced by a letter
      \item for each question and answer the associated text is stored
      \item answers are classified into correct and incorrect ones
    \end{itemize}
    \medskip
    
    Develop an ER diagram. 
    \medskip
    
    What is the complete key for each of the entity sets?
  \end{quiz}  
\end{frame}

\theme{IS-A, `Inheritance'}