Examination of historical semi-controlled data related to a current laboratory environment provides a powerful quality control tool by yielding information for such items as: (1) mathematical correction of unidentified systematic deviations; (2) estimation of confidence in lab results; and (3) detection of correctable trends. The object of this presentation is to discuss some concepts of a computerized quality control system. Topics include: (1) data flow and control; (2) use of statistics and graphics in data examination; (3) aspects of human interaction with a computerized system; and (4) the advantages and possible disadvantages of using the described system
