As Fritz has mentioned several times and there always appears to be a request for this - here is the link for the migration documents as well as the path.

Link to the thread
Guideline IS Migration Workbench (transaction EMIGALL)

Link to the marketplace:
Research Resources and Rules of Engagement
Navigate to the Technical information center > Migration

Direct Links to the documents on the Service Marketplace:
Performance Migration:
https://service.sap.com/~sapdownload/011000358700000500562009E/Cookbook_Perf_Migration.pdf

Migration Guidelines:
https://service.sap.com/~sapdownload/011000358700000500572009E/Guideline_ISMW.pdf

regards,
bill.