Governance of Enterprise IT - Discussion

> Do you believe the PDCA Model is an important part of the ISO 27001 process? If so, why? If not, why not?

> What is the value of the ISO 27001 certification to a business?

> What do you view as key issues when selecting an ISO 27001 auditing company?

Need minimum 3 pages with peer-reviewed citations. No need for introduction or conclusion.