I work as an IT Auditor as the lead / most senior member of a team of 5, including myself. Currently we are looking to work with a new vendor to replace our current vendor for a specific business process.
Today my boss called me into a meeting and stated he would like me to go onsite at the vendor for a security risk assessment. This proposed vendor is fairly large, and will be handling sensitive company information (PII). The scope is fairly involved and includes many areas to review such as access, data protection, BCP/DRP...etc.
Given the size of the proposed vendor and the sensitivity of the service they provide to us, I would like at least 1 other member of the team to accompany me onsite for process walkthroughs, interviews...etc. to maximize coverage. However, when I raised my request to my boss, he seemed hesitant and stated we have other pressing work (ex: SOX preparation) to do. If 2 members go, 3 will remain, which I feel is adequate coverage.
I also think this is a good learning opportunity for younger team members. (I stated in some of my previous questions team members sometimes lack experience). Meeting and learning to evaluate a vendor can be quite educational.
How can I persuade my manager allow additional team members to accompany me?