This user's guide documents the procedures used to collect, process, and summarize data from the 2009 High School Transcript Study (HSTS 2009). Chapters detail the sampling of schools and graduates (chapters 2 and 3), data collection procedures (chapter 4), data processing procedures (chapter 5), and weighting procedures (chapter 6). Chapter 7 describes the HSTS 2009 data files and codebooks. Appendices A through H contain the HSTS 2009 data collection and documentation forms. Appendix I describes the Classification of Secondary School Courses (CSSC) and provides a complete listing of CSSC codes, which were used to code the courses listed on the HSTS 2009 transcripts. The codebooks for all of the HSTS 2009 restricted-use data files are in appendices J through Q, and a glossary of terms is in appendix R. Appended are: (1) Disclosure Notice; (2) School Information Form (SIF); (3) Transcript Request Form; (4) Letter Requesting Catalogs; (5) Sample Introductory Letter to Principals; (6) NAEP [National Assessment of Educational Progress] in Your School--HSTS brochure; (7) Transcript Format Checklist; (8) Course Catalog Checklist; (9) Classification of Secondary School Courses Hierarchical Listing and Detailed Stub List; (10) 2009 High School Transcript Study Codebook for Catalog File; (11) 2009 High School Transcript Study Codebook for Master CSSC File; (12) 2009 High School Transcript Study Codebook for NAEP Data File; (13) 2009 High School Transcript Study Codebook for School File; (14) 2009 High School Transcript Study Codebook for SD/ELL File; (15) 2009 High School Transcript Study Codebook for Student File; (16) 2009 High School Transcript Study Codebook for Test File; (17) 2009 High School Transcript Study Codebook for Transcript File; and (18) Glossary. (Contains 7 tables, 1 figure and 26 footnotes.)