> With the design part i've got to make a PSD - Program Structure Diagram. Is that the graphic notation where a loop is a small box which is soft of left and top enclosed by the condition? When I was assisent in Delft (> 10 y ago) I had to check such drawings. I hoped this technique (which adds absolutely nothing over simple C, Pascal or pseudo code) would be abandoned by now... As for tools: pen and paper? My favourite Yourdon tool is still my tea mug (must be empty though). Wouter -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.