\tikzset{
  process/.style={
    rectangle,
    minimum width=2.5cm, minimum height=1cm,
    draw,
    text centered
  },
  % Decision (diamond)
  decision/.style={
    diamond, aspect=2,
    minimum width=2.5cm, minimum height=1cm,
    draw,
    text centered
  },
  % Arrow style
  arrow/.style={
    thick, ->, >=Stealth
  }
}

\begin{tikzpicture}
  \node (start) {};
  \node[decision, below=of start] (decision) {\textbf{\textcolor{magenta}{Bedingung}}};
  \node[process, below=of decision] (process1) {\textbf{\textcolor{orange}{Anweisungen1}}};
  \node[process, right=of process1] (process2) {\textbf{\textcolor{orange}{Anweisungen2}}};
  \node[below=1.2cm of process1] (end) {};

  % Arrows
  \draw[arrow] (start) -- (decision);
  \draw[arrow] (decision) -- node[right] {Wahr} (process1);

  % Decision branch
  \draw[arrow] (process1) -- (end);
  \draw[arrow] (decision) -- node[above] {Falsch} ($(decision.east) + (1cm, 0)$) -| (process2);
  \draw[arrow] (process2.south) -- ($(process2.south) + (0, -0.4cm)$) |- ($(process1) - (0, 1.1cm)$);
\end{tikzpicture}