Hello Shalini,
A lot of information has been given by Mr Simhan, Mr Keshav Kargoankar and Mr Somnath Roy Choudhary.
I found the list of Demings Principle was the only missing link.
PDCA had its origin in Shewarts cycle.
You may find the attachment interesting.
A lucid explanation has been given describing each of Deming Principle.
The attachment is prepared by FDR Safety.
V.Raghunathan