Change Everything Readily Except the Purpose & Core Values
Visionary companies preserve their core ideologies while relentlessly stimulating progress and improvement.
The real heart of what makes visionary companies so successful is that while they jealously guard the permanence of their core ideologies, the manifestations of that core ideology are always open for change and progress.
For example, Wal-Mart's drive to “exceed customer expectations” is a stable element of its core ideology, but the customer-greeters at the entrance to their stores are a practice that can change.