The most obvious tool to use is the Self Assessment lists that should be provided by the Accreditation agencies. If they are taken seriously, and each question is truly examined, this should be adequate to prevent "show stoppers" from happening. The operational processes should also be evaluated by touching on the Quality Essentials as you review them. For example, if you are looking at your "crossmatch" process, you can pull in Equipment, Audits, Reagents/Suppliers, QC, Facilities, Computers, Records, etc. to be sure they are in compliance. I am employed in the Quality Assurance Department of a large Blood Center