This is the README file for the GAP4 package FORMAT by Bettina Eick and Charles R.B. Wright. The package contains programs for computing with formations of finite solvable groups and with various formation-theoretic subgroups. Running the package: No special preparation is required. Simply move the format directory to the GAP pkg directory, start GAP and use the command LoadPackage("format") to load the programs into GAP. Examples: The subdirectory `grp' contains various examples of pc groups. They can be used as examples for applications of the package.