Six sigma master black belt David Lengacher warns about a common oversight in change management programs. Managers must address beliefs and behavior, he says, not culture. Browse the business management section at your local bookstore and you will find many top selling management books proclaiming that all measures of performance should be directly traceable to the objectives of the organization. It is hard to argue with this, but it is often overemphasized to the degree that it can cause significant organizational side effects.