Exams passed or years of experience in a field aren’t arguments for being good at something, particular not delivery, despite job spec often state these requirements. Better arguments are mindset and examples of the actions the mindset has lead to.
I hope to see job specifications one day that describes the required mindset not how many years a person has worked or which project methodologies he or she can explain in great details but not necessary apply to a real world situation. Mindset impacts how people work, not the exams they have passed. Knowledge is required, but is not the best factor to determine who is best at delivering a project or change.