Dan Callies can relate to those well-intended plumbers who, despite their best efforts, watch their well-organized service trucks slowly fall victim to misplaced and damaged parts, and failure to accurately track inventory. After all, the president of Oak Creek Plumbing in Oak Creek, Wisconsin, has been there himself.But realizing that mismanaging truck inventory has a cost, Callies decided to do something about it. The solution: On a rotating, tri-monthly basis, each of the company’s seven plumbing service trucks gets completely restocked, somewhat akin to what retail store employees do periodically to capture an exact picture of inventory. Only this company’s
