Hello sir Ludovic, I'm just starting off with the alliance software which I find very interesting. I tried to reproduce the inverter, AND gate and NOR gate examples(layouts) on the alliance site with this link: http://asim.lip6.fr/alliance.html, so as to use them for educating students etc., Everything from the start works well, however when I get to the portion of Using the Standard Cell Router, upon issuing the command, for example "scr -p -r -i 1000 tonton1", operation stops at 0% for the placement in process of treatment and the cursor just keeps on blinking. here is the output below: Alliance CAD System 4.0.6, scr 5.3 Copyright (c) 1991-2001, ASIM/LIP6/UPMC E-mail support: alliance-support@asim.lip6.fr Loading logical view : tonton1 Placing logical view : tonton1 Loading SCP data base ... Original width : 15 Generating initial placement ... 1 cells 4 nets in 1 rows Placement in process of treatment : _ 0% I tried increasing and later I reduced the # of iterations to 500, 50, even 10, but it still gets stuck at the same "placement in process of treatment" step. What can I do sir, to correct the problem. I hope you would respond to this concern, since the graal & wont work(empty) without the scr .... step. Thanks sir John DB --------------------------------- Do You Yahoo!? Make a great connection at Yahoo! Personals.