Patrick: Thank you for the infomation. Les westfeldt <westfeldt_nbcd@xxxxxxxxx> wrote: Yes. I just did a design in Allegro 15.1, customer altered in 15.2, gave it back to me, no problem. The Orcad sch part of the package revs back and forth to a much wider range. Patrick Westfeldt, Jr. North Boulder Circuit Design westfeldt_nbcd@xxxxxxxxx 720-406-0887 c 720-272-5822 --------------------------------- From: Les Wong [mailto:maveric0@xxxxxxxxxxx] Sent: Friday, January 28, 2005 9:46 PM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Cadence Design Studio 15.2 Hi All: Is Design Studio 15.1 and 15.2 upward and downward compatible ? Thanks, Les