\begin{frame}
  \frametitle{Entity-Relationship Models Summary}
  \bigskip
  {\small
  \begin{tikzpicture}[every edge/.style={link},node distance=12mm,>=triangle 45]
    \node[entity] (R) {E};
    \node [align=left,anchor=west] at (.9cm,0cm) {entity set};

    \node[attribute] (R) at (6cm,0cm) {A};
    \node [align=left,anchor=west] at (6.6cm,0cm) {attribute};

    \node[weak entity] (R) at (0cm,-1.7cm) {E};
    \node [align=left,anchor=west] at (.9cm,-1.7cm) {weak entity set};

    \node[multi attribute] (R) at (6cm,-1.7cm) {A};
    \node [align=left,anchor=west] at (6.6cm,-1.7cm) {multi-valued attribute};

    \node[relationship,minimum size=9mm] (R) at (0cm,-3.4cm) {R};
    \node [align=left,anchor=west] at (.9cm,-3.4cm) {relationship set};

    \node[derived attribute] (R) at (6cm,-3.4cm) {A};
    \node [align=left,anchor=west] at (6.6cm,-3.4cm) {derived attribute};

    \node[ident relationship,minimum size=9mm] (R) at (0cm,-5.1cm) {R};
    \node [align=left,anchor=west] at (.9cm,-5.1cm) {identifying\\relationship set\\for weak entity set};

    \begin{scope}
    \node[relationship] (R) at (4.6cm,-5.1cm) {R};
    \node[entity,minimum width=7mm] (r) [right of=R,xshift=4mm] {E}; \draw [double,double distance=.7mm] (R) -- (r);
    \node [align=left,anchor=west,opacity=0.25] at (6.6cm,-5.1cm) {total participation\\of entity set\\in relationship};
    \end{scope}

    \node[attribute] (R) at (0cm,-6.8cm) {\key{A}};
    \node [align=left,anchor=west] at (.9cm,-6.8cm) {primary key};

    \node[attribute] (R) at (5.7cm,-6.8cm) {\disc{\;\;A\;\;}};
    \node [align=left,anchor=west] at (6.6cm,-6.8cm) {discriminating\\ attribute of\\ weak entity set};
  \end{tikzpicture}
  }
\end{frame}