Our company has a multi-site certificate. Currently I do the audits at 3 sites... my home site (major) I audit all the time, the off-sites (minor sites) I do a "sweep" audit of all applicable clauses during the course of a week, two or three times/year. Clearly this doesn't fit the "all at the same time" scenario, but has been quite effective.
There are two additional sites, one of those being also a major site. In January, we coordinate our schedules of the two major sites in a general way... we try to do the same clause(s) within the same month. It doesn't always work out.
We do have the rationale and schddules for the major and minor site approved by corporate before implementation, and in the QMR we have evidence in a read-ahead package that details the classifications of findings and a review by the audit manager of any findings believed to cross site boundries... and of course any c/a taken on those items.
This system has been acceptable, even appreciated by our registrar... but it is destined to change as we have almost doubled in size in the past 2 years. New corporate directorate wants everything to appear the same at each site and it looks like I'll be charged with making that happen.
Of course I'm going to consider some of the valuable input you all have discussed above as I begin to develop that plan...
