This question relates to the Figure 8-2 on PMBoK 5 guide.
Figure 8-2. Fundamental Relationships of Quality Assurance and Control Quality to the IPECC, PDCA, Cost of Quality Models and Project Management Process Groups.
This explains the fundamental relationships of comparing processes with other methodologies. I would like to understand its importance and how they would help in answering some specific questions? With the PDCA model we understand Plan as in Planning, Do as in Executing, Check and Act as in Monitoring and Controlling. Similarly, any references to the others? Would they be widely applied?