You can use the links below to read about the major changes made to RATS over the years, dating back to version 4.0, which was released in 1992.

See Version 10 for details on the current release.

For details on previous versions, see:

  • Version 7 for a history of versions 7.0 through 7.3.
  • Version 6 for a history of versions 6.0 through 6.35.
  • Versions 4 and 5 for a history covering Versions 4.0 through 5.11.