Ken Best as I remember, Incases Autoboard layout tool will do all of these checks in real time as you design, as well as prompt the designer to input workable insertion sequences where that is an issue; all assuming the correct information is built into the library parts. Since I'm currently using a major CAD system that doesn't fully do this I'd also be interested if you find a post-layout tool that does. Regards Tom Thomas G. Martin Sr. PCB Designer ASE Technologies USA "The opinions expressed herein are my own and not necessarily those of my employer." ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################