\documentclass{standalone}

\usepackage{tikz}
\usetikzlibrary{shapes.symbols}
\usetikzlibrary{arrows}
\usetikzlibrary{calc}

\begin{document}

\begin{tikzpicture}[>=stealth]
  \draw [transparent] (-0.5,-0.5) -- (5.5,5.5);
  \draw [->] (0,0) -- (0,5);
  \draw [->] (0,0) -- (5,0);

  \node[draw,red,cloud,minimum height=2cm,minimum width=2cm] (mop) at (2,3) {$\color{black}\bullet$};

  \node (os) at (1,1.5) {CLOS};
  \draw (os) -- (mop.center);

  \node[red] (mspace) at (4,5) {AMOP space};
  \draw[red] (mspace) -- (mop);

  \node (hash) at (1.8,3.4) {$\bullet$};
  \node (osh) at (1,4.5) {sparse slots};
  \draw (osh) -- (hash.center);

  \node (mnu) at (3.5,1) {$\bullet$};
  \node[anchor=north] at (3.5,1) {message-not-understood};
\end{tikzpicture}

\end{document}