Dear Patrick,
you can embedding a Gantt chart into a LyX document just like any other
chart too. That is: Create you your Gantt chart, your network planning
chart or whatever you want to have with any program with which you want.
Then you make a picture of it, if possible in a vector graphics format.
If you are using latex as compiler, EPS is recommended as a graphic
format, when you use pdflatex or xelatex, rather PDF. In LyX then you
create a float using Insert -> Floats -> Picture, give the image a name
by caption, adding a label and place here via Insert -> Graphics your
EPS or PDF file (the Gantt chart).
The question of how you can embedding a Gantt Chart in LyX, so offers no
difficulties. More interesting is the question of how you create it. In
my opinion it's not a good idea to take easy the Gantt chart from MS
Project or ProjectLibre, because it looks not not like pretty. At the
moment I use Harvard Chart XL 3.0 to create the Gantt chart as such and
Inkscape to add shortcut arrows and milestones.
Best regards
Marcus
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