This collection contains appellate information from the 12 circuit courts of appeals of the United States. The United States Sentencing Commission compiled from the Clerk of the Court of each court of appeals the final opinions and orders, both published and unpublished, in all criminal appeals for the time period surveyed. The Commission also collected habeas corpus decisions (although technically civil matters), because such cases often involve sentencing issues. Both the "case" and the "defendant" are used in this collection as units of analysis. Each "case" comprises individual records representing all codefendants participating in a consolidated appeal. Each defendant's record comprises the sentencing-related issues corresponding to that particular defendant. The 1993 data file (Part 1) includes all appeals cases received by the United States Sentencing Commission as of December 22, 1993, that had disposition dates between March 9, 1990, and September 30, 1993 (inclusive). The 1994 file (Part 2) includes all appeals cases received as of December 23, 1994, that had disposition dates between October 1, 1993, and September 30, 1994 (inclusive). The 1995 data file (Part 6) includes all appeals cases received as of December 26, 1995, that had disposition dates between October 1, 1994, and September 30, 1995 (inclusive). The 1996 data file (Part 7) includes all appeals cases received as of December 27, 1996, that had disposition dates between October 1, 1995, and September 30, 1996 (inclusive). The 1997 data file (Part 8) includes all appeals cases received as of December 27, 1997, that had disposition dates between October 1, 1996, and September 30, 1997 (inclusive). The 1998 data file (Part 9) includes all appeals cases received as of December 27, 1997, that had disposition dates between October 1, 1997, and September 30, 1998 (inclusive).