Carmen has a number of options which the company can select, and a manual input facility. I have seen it in use in two companies: in the first, a sensible option was selected and the manual input was from a competant rostering manager; the second, the selected ludicrous option was manualy imputted by a well known idiot. The first worked a treat, the second could have brought down the company. But which one got a £250000 bonus?