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 8 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.