[Tex/LaTex] How to construct a waterfall model diagram by LaTeX in Beamer


I need to construct a Waterfall model diagram like these:



Best Answer

An alternative to Gernot nice answer, in which is employed chains TikZ library and connection between nodes are establish in a loop:

\documentclass[tikz, margin=3mm]{standalone}

    node distance = 3mm and 3mm,
      start chain = A going below right,
every node/.style = {draw, text width=24mm, minimum height=12mm, align=center,
                     inner sep=1mm, fill=white, drop shadow={fill=black},  on chain=A},
\node {Requirements}; % A-1
\node {Design};
\node {Coding and unit test};
\node {System integration};
\node {Operation and maintenance};
\foreach \i [count=\j] in {2,...,5}
  \draw[->, thick] (A-\i) -| (A-\j);
  \draw[->, thick] (A-\j) -| (A-\i);

enter image description here

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