All, I've put a new version of the architecture document on GridForge at https://forge.gridforum.org/sf/docman/do/downloadDocument/projects.ogsa- d-wg/docman.root.working_drafts/doc13621/1. This version addresses most of the issues raised by our recent review. I've also attempted to address the issues raised by some of the comments in the document itself - see the attached text file. I would appreciate any feedback on these changes (especially with regard to whether I can now delete the relevant comments). The changes in this version are primarily in the introductory and background sections. I still want to do more work on the technical sections, in particular spending more time on the interface outlines. Best wishes, Dave Berry Deputy Director, Research & E-infrastructure Development National e-Science Centre, 15 South College Street Edinburgh, EH8 9AA +44 131 651 4039