Cfrgtkky

I want to produce the following flow chart with smartdiagram and need some hints how to draw extra arrows and symbols.

So far I got this one

with the following code

documentclass[border=10pt]{standalone}

usepackage{smartdiagram}



begin{document}



smartdiagram[flow diagram:vertical]{Define,

  Measure, Analyze, Improve, Control}



end{document}

Any help, please.

I try to replicate your diagram using TikZ (because smartdiagram is also a package based on TikZ).

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

usetikzlibrary{shapes}

usepackage{helvet}

tikzset{rounded/.style={

    rectangle, draw,

    rounded corners=3pt, 

    minimum width=4cm,

    minimum height=0.7cm

}}

begin{document}

begin{tikzpicture}

sffamily

    node[rounded] (d) at (0,0) {[D] Define};

    draw[thick,->] (4,0)--(d);

    node[rounded] (m) at (0,-2) {[M] Measure};

    draw[thick,->,color=black!30] (4,-2)--(m);

    node[rounded] (a) at (0,-4) {[A] Analyze};

    draw[thick,->,color=black!30] (4,-4.1)--(2,-4.1);

    draw[thick,->,color=black!30] (2,-3.9)--(4,-3.9);

    node[rounded] (i) at (0,-6) {[I] Improve};

    draw[thick,->,color=black!30] (i)--(4,-6);

    node[rounded] (c) at (0,-8) {[C] Control};

    draw[thick,->] (c)--(4,-8);

    draw[thick,->] (d)--(m);

    draw[thick,->] (m)--(a);

    draw[thick,->] (a)--(i);

    draw[thick,->] (i)--(c);

    draw[thick,->] (4,-8)--(4,0);

end{tikzpicture}

end{document}

smartdiagram gives the nodes names moduleX where X is an integer. This can be exploited. (I am not sure I interpreted "extra symbols" correctly, but of course you can add any symbol instead of the arrow heads.)

documentclass[border=10pt]{standalone}

usepackage{smartdiagram}

tikzset{every picture/.append style={remember picture}}

begin{document}



smartdiagram[flow diagram:vertical]{Define,

  Measure, Analyze, Improve, Control}

begin{tikzpicture}[overlay]

 foreach X in {2,4}

 {draw[stealth-,line width=1mm,red!40] (moduleX.east) -- ++ (0.5,0) coordinate

 (aux-X);}

 draw[-stealth,line width=1mm,red!40] ([yshift=1.5mm]module3.east) -- ++ (0.5,0)

 coordinate (aux-3);

 draw[stealth-,line width=1mm,red!40] ([yshift=-1.5mm]module3.east) -- ++ (0.5,0);

 draw[-stealth,line width=1mm,red!40] (module5.east) -- ++ (0.5,0) coordinate (aux-5);

 path (module1.east) -- ++ (0.5,0) coordinate (aux-1);  

 foreach X [remember=X as Y (initially 1)] in {2,...,5}

 {path (aux-Y) -- (aux-X) coordinate[pos=0.4](mid-X);

 draw[-stealth,line width=1mm,red!40] (aux-X) -- (mid-X);}

end{tikzpicture}  

end{document}

one more tikz solution. with use of the tikz libraries arrows.meta (for arrows) and chains (for put nodes in chain) the mwe is:

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

usetikzlibrary{arrows.meta, chains}



begin{document}

    begin{tikzpicture}[

node distance = 4mm,

  start chain = A going below,

   arr/.style = {-Triangle, semithick},

   box/.style = {rectangle, draw, rounded corners,

                 minimum width=33mm, minimum height=6mm,

                 on chain=A, join=by arr}

                        ]

node[box]  {[D] Define};       % A-1

node[box]  {[M] Measure};

node[box]  {[A] Analyze};

node[box]  {[I] Improve};

node[box]  {[C] Control};      % A-5

%

draw[arr]  (A-5.east) -- ++ (1,0) coordinate (aux)

                       |- (A-1);

draw[arr, gray]

    (A-2 -| aux) edge (A-2)

    ([yshift=+3pt] A-3.east)          edge ([yshift=+3pt] A-3.east-| aux)

    ([yshift=-3pt] A-3.east -| aux)   edge ([yshift=-3pt] A-3.east)

    (A-4)         to  (A-4 -| aux);

end{tikzpicture}

end{document}