The BW customizers and developers require a checklist entitled How to SAP BW3.5 - upgrade preparation and post-upgrade activities. This checklist can be located in the 'How-to Guides' section at http://service.sap.com/bi. It explains in detail all activities in checklist format needed to upgrade to SAP BW3.5.
The Basis administrator should obtain the Component Upgrade Guide for BW3.5x. This is available for download at http://service.sap.com/instguides
This was first published in June 2006