This supplement contains documentation on all the derived variables contained in the TEDS-M educator and future teacher data files. These derived variables were used to report data in the TEDS-M international reports. The variables that constitute the scales and indices are made available as part of the TEDS-M International Database to be used in secondary analyses. This supplement has three sections: Section 1: Educator Questionnaire; Section 2: Future Teacher Questionnaire (Parts B and D); and Section 3: Future Teacher Knowledge Assessments (Part C). In each section the variable name given to the derived variable is provided first, followed by the variable names of the variables used to construct the derived variable. The variables that were used to derive the indices and scales are presented in the order they appear in the instruments. The following information is provided for each derived variable: (1) Variable Name: The name of the derived variable; (2) Description: A description of the variable content or domain; (3) Procedure: A procedural description of how the derived variable was computed; and (4) Source: The source variables used to derive the scale or index. (Contains 3 footnotes.) [For the main report, "TEDS-M 2008 User Guide for the International Database," see ED542383. For related reports, see "TEDS-M 2008 User Guide for the International Database. Supplement 1: International Version of the TEDS-M Questionnaires" (ED542382), "TEDS-M 2008 User Guide for the International Database. Supplement 2: National Adaptations of the TEDS-M Questionnaires" (ED542381), and "TEDS-M 2008 User Guide for the International Database. Supplement 4: TEDS-M Released Mathematics and Mathematics Pedagogy Knowledge Assessment Items" (ED542384).] [This paper was edited with Maria Teresa Tatto.]