Introduction to quality assurance -- Precision, bias, and accuracy -- Statistical controls -- Statistical techniques -- Chemical analysis as a system -- The model -- Planning -- Principles of sampling -- Principles of measurement -- Principles of calibration -- Principles of quality assurance -- Principles of quality control -- Blank correction -- Control charts -- Principles of quality assessment -- Evaluation samples -- Reference materials -- Traceability -- Quality audits -- Quality circles -- Validation -- Reporting analytical data -- An improved approach to performance -- Correction of errors and/or improving accuracy -- Laboratory evaluation -- The Quality assurance program.