The PDCA Cycle was originally developed by Walter Shewhart, the pioneering statistician who developed Statistical Process Control in US. It was promoted by the Quality Management authority, W. Edwards Deming as a tool for tracking and guiding ones continuous improvement efforts and is known by many as The Deming Wheel. The tool emphasises and demonstrates that improvement programs must start with careful planning, must result in effective action and must move on again to careful planning in a continuous cycle.