Some important requirements
To be effective, this simple but powerful feedback idea has some special requirements:
- The plan must be expressed in terms that can be measured during project execution
- Otherwise it will not be possible to draw the required comparisons
- The observations during project execution must be consistent with elements of the plan
- And vice versa, to make the required comparisons
- The comparisons must be made frequently and rapidly
- Sufficiently frequent and rapid to enable corrective action while time and resources still permit