What is the difference between ANSI/ASQC Z1.4 1993 and ANSI/ASQ Z1.4-2003?
In December 2003 the ASQ (American Society for Quality) released the ANSI/ASQ Z1.4-2003 standard. This is a revision to the ANSI/ASQC Z1.4-1993 standard. The name of the standard was changed to drop the “C” to reflect the 1997 name change of American Society for Quality Control to the current American Society for Quality. The definition of AQL has been changed from Acceptable Quality Level to Acceptance Quality Limit . The Discontinuation of Inspection rule has been changed from 10 consecutive lots or batches on tightened inspection to 5 consecutive lots or batches not accepted on tightened inspection. The notes in this revision specify that the numbers and tables remain the same as the MIL-STD-105E except for the changes to the footnotes. ANSI/ASQ Z1.4-2003 makes the use of the limit numbers for switching to reduced optional. In addition, ANSI/ASQ Z1.4-2003 contains additional OC curves called scheme OC curves that describe the protection provided by the switching procedure during per
