The importance of quality control in the success of any business is becoming more widely recognized. Although the American construction industry has been slow to take advantage of the benefits of quality control concepts and programs, changes are being made. For concrete producers, a good place to start a program is in the measuring, tracking, and analyzing of concrete quality as indicated by compressive strength testing. Although many producers already test compressive strength cylinders regularly, some view this testing as a necessary evil required by project specifications, or as a defensive measure to guard against poor testing of their concrete by others. To make compressive strength testing a useful tool in quality control, it must be done systematically. Results should be analyzed so changes in procedure, materials, or processes can be made rationally. The basic concepts of staff involvement, statistical control, and trend analysis can be applied to any facet of concrete production. Don't forget the value of letting your customers know about your quality control programs.