I noticed that Kraft has an analogous approach to BRC for Supplier Approval which may be of interest to some people.
Kraft has a tiered approach for their suppliers based on a risk analysis of the material (Tier Rating) .
The Tier Rating determines several items including (a) the types of audits & certificates which are accepted for both initial approval of the site and for ongoing audits, (b) the audit frequency.
The Kraft Audit Matrix (2012) presenting the relationship between (a,b) and the Tier Rating for an extensive range of foods is illustrated, together with details on its implementation, in the attachment below (eg Pgs 20-26)
Kraft Foods Supplier Quality, 2012.pdf 2.88MB 160 downloads
Rgds / Charles.C