Deming's process improvement model, the "PDCA" cycle, consists of four steps:

• Plan
• Do
• Check
• Act

I think organizations progress from a "Do" cycle (with no planning), to a "Plan-Do" cycle (with no check), to a "Plan-Do-Check-Act" cycle. Personally I have created project plans for process improvement that did not include any post-implementation check-ups--and without these check-ups it's easier for the improvement to "roll back" if it wasn't implemented fully.