Discussion of definition of cleanroom occupation status: part 2 of the series of research practice of the national standard task group for the Code for cleanroom construction and acceptance test

Presents the definitions of cleanroom occupation status in US federal standards, EU GMP and ISO standards, and summarizes the difference of these definitions. Analyses the obstacles probably encountered in actual project certification and assessment procedure for the cleanroom occupation status defined in the ISO 146441—1999 standard, and proposes a definition framework.