Corrugated containers are only as good as the quality of their component parts. Knowing that your components meet, if not exceed, quality specifications is critical to the success of your laboratory. Therefore, you need an interlaboratory testing program that will provide you with an unbiased way to determine whether you are indeed achieving your measurements goals. Unique among the CTS programs, the Containerboard Program was designed as a collaborative reference program: linerboard, corrugating medium and corrugated board samples are taken from one lot, randomized, and sealed at one time for repeated distribution. Corrugated boxes are selected and randomized in a similar manner. Weekly and monthly testing of these materials provides a means of continuous measurement assessment that allows your laboratory to monitor performance and take corrective action if necessary.