\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{mindmap,trees}
\begin{document}
\pagestyle{empty}
\begin{tikzpicture}
  \path[mindmap,concept color=black,text=white]
    node[concept] {Safety Engineering}
    [clockwise from=0]
    child[concept color=green!50!black] {
      node[concept] {practical}
      [clockwise from=90]
      child { node[concept] {Certification } }
      child { node[concept] {Maintenance} }
      child { node[concept] {Staff Training} }
    }  
    child[concept color=blue] {
      node[concept] {applied}
      [clockwise from=-30]
      child { node[concept] {Standards} }
      child { node[concept] {Insurance Liability} }
    }
    child[concept color=red] { node[concept] {Accident Investigation} }
    child[concept color=orange] { node[concept] {theoretical} };
\end{tikzpicture}\end{document}