PART 4000 INORGANIC NONMETALLIC CONSTITUENTS Part Coordinator Edward F. Askew JOINT TASK GROUP CHAIR FOR THE 22ND EDITION 4020 Quality Assurance/Quality Control ....................................................................Edward F. Askew SUMMARY OF MAJOR CHANGES SINCE 2005 Quality Assurance/Quality Control (4020) was significantly revised to stay abreast of regulatory requirements and clarify the essential quality control practices for test methods in Part 4000. Also, many methods now refer users to the quality control practices that are considered to be an integral part of the method.