Hi All, I have two questions for those of us that use Capability Potential and Capability Performance Indices. 1) When the mean of the data falls outside the specification limits, is Cpk negative or zero? 2) Does anyone have specific references that delve into the details of Cp and Cpk? Thanks for your help. Ron Rhodes Conductor Analysis Technologies Inc. Phone: 732-424-1919 Fax: 732-424-1886 Email: [log in to unmask] Web: http://biz.swcp.com/cat ################################################################ 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 ################################################################