Re: The Essential VDA Standards - VDA 6.1, 6.2, 6.3, 6.4 and 6.5
VDA 6.3 is a format for process audits and is used by a number of companies that are certificated to TS.
There is no obligation to use this format if you are not required by a customer.
For more details see this search
or these attachments
(They might be out of date )
Lean starts with your documentation