9000:2000 vs 9001:2000
Energy - This is a simple one!
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ISO 9000-2000 is the Quality Management Systems - Fundamentals and vocabulary
ISO 9001-2000 is the QMS - Requirements
It even states in the introduciton section of the 9001:2000 standard that "Management principles stated in ISO 9000 and ISO 9004 have been taken into consideration during the developement of this international standard."
The 9000-2000 is a 'Normative' reference to the standard (covered in standard again on page 1 #2).