If I remember correctly its a table, and the boxes are connected across the table with arrows, shows relationships and multi tasking responsibilities well. Its not one of my favorites, but does serve some purpose to look in at the whole responsibilities/logistics picture. I used it years ago on mapping a JIT line, showing repetition. Worked well there. Don't think I have any kicking around....but will keep it in mind, and post if I find one.
Or maybe thats not the same thing, don't remember acronym we called it. I called it an audit tool...used to address it in auditor training, filling the auditor's tool box.....