The Occupational Injury and Illness Classification Manual provides a classification system for use in coding the case characteristics of injuries, illnesses, and fatalities in the Survey of Occupational Injuries and Illnesses (SOII) and the Census of Fatal Occupational Injuries (CFOI) programs. This manual contains the rules of selection, code descriptions, code titles, and indices for the following code structures: Nature of Injury or Illness, Part of Body Affected, Source of Injury or Illness/Secondary Source of Injury or Illness, Event or Exposure. The Bureau of Labor Statistics' Classification Structure Team developed the original Occupational Injury and Illness Classification System (OIICS) with input from data users and States participating in the BLS Occupational Safety and Health Statistics (OSHS) Federal/State cooperative programs. The original system was released in December 1992. It was approved for use as the American National Standard for Information Management for Occupational Safety and Health in 1995 (ANSI Z16.2-1995). In developing this manual, BLS sought input from many interested parties. In February 2008, a Federal Register Notice on the proposed change to the manual was issued. In addition, the OIICS Revision Team sent out numerous letters and e-mails to users. Based on the initial comments received and other information, the team developed a draft 2010 manual that was disseminated to interested parties in April 2010. The team considered comments received, made revisions, and completed the final manual in September 2010. Version 2.01 dated January 2012, and annotated with 01/12 at the bottom of the page, is a minor update to version 2.0. It corrects some errors and incorporates some clarifications to the version issued in September 2010.