A program and method enables easy creation and manipulation of timing charts. The preferred embodiment employs off-the-shelf commercial software and uses Visual Basic commands to get timing chart drawing commands into the drawing program and out of the spreadsheet program to order the drawing program to produce a displayable and print/plotable file. The user can easily see changes needed and even if they require ripple-through redrawing, because the user manipulates data in the spreadsheet file instead of directly manipulating drawing commands, the spread sheet will carry through ripple-through calculations to modify all lines related to the recalculated data.