...aren't they project stuff. Two people doing this for 3 days. Task A needs to be done before Task B. That kind of thing?<BR><BR>I know this is taught in the UK at A-level under the title of "Decision Mathematics". Searching for that in Google may give you some ideas of the mathematics behind producing them. And you'll need to understand them if you want to produce a Gantt chart properly.<BR><BR>Craig.