Logigramme

\documentclass{article}

\usepackage[a4paper,margin=2cm]{geometry}
\usepackage{tikz}
\usetikzlibrary{shapes}

\begin{document}

\begin{tikzpicture}[y=-1cm]
  \node[draw,ellipse] (DM) at (0,0) {Data mining};
  \node[draw,ellipse] (P) at (-3,1.5) {Predictive};
  \node[draw,ellipse] (D) at (3,1.5) {Descriptive};
  \draw (P)--(DM)--(D);
  \draw (P)--++(0,4.5) (D)--++(0,3.5);
  \foreach \i/\j in {2/A, 3/B, 4/C, 5/D} {
    \node[draw,ellipse](\j) at (-1.5,1+\i) {\quad\j\quad~};
    \draw (-3,1+\i)--(\j);
  }
  \foreach \i/\j in {2/E, 3/F, 4/G} {
    \node[draw,ellipse](\j) at (1.5,1+\i) {\quad\j\quad~};
    \draw (3,1+\i)--(\j);
  }
\end{tikzpicture}

\end{document}