Answer:
Quality Assurance Analysis
Step-by-step explanation:
Here the work performed by Joe is that of Quality Assurance.
As Joe has performed the root cause analysis understanding the defects, and then further took a step to analyse the defects and their pattern in order to find the solution for those defects.
Whenever there is Quality Control Performed then we check the defects caused, and their sources.
In Quality Assurance a further step to Quality Control is taken and it is analysed what are the impacts of such defects on the process.
Therefore, the answer is
Quality Assurance Analysis