The files in this zip file represent a major revision of the information in DDI_3.0_Part_I_Overview.pdf Appendix 4: DDI 2.1 to DDI 3.0 Mapping. Review of the document raised a number of questions which were addressed prior to this version. It is important to read the document, DDI_2_1_to_3_0_TranslationInstructions_2009version.doc, prior to using the spreadsheet. Given the major structural differences between DDI 2.1 and DDI 3.0, sections of the translation are not straightforward element-to-element transfers of content. Questions regarding specific items or general instructions should be sent to Wendy Thomas, TIC Chair, wlt@pop.umn.edu