In the world of continuous improvement, it might seem that one does not want to look back. After all, as systems improve, old data is no longer useful, and keeping it around—like keeping old love letters—may someday get you into trouble.

Knowing when to recalculate control limits is important, as quality managers know.

(PQ Systems Inc.: Dayton, OH) -- PQ Systems is now offering Right First Time , a classic British film that examines key quality issues, on DVD. This 28-minute film is an entertaining yet clear and concise way to communicate key quality concepts to everyone on your team.