The data can be read in and then printed, but no actual calculation is performed when this keyword is used. This is useful as a check on the input data. All obvious errors are trapped, and warning messages printed. A second use is to convert from one format to another. The input geometry is printed in various formats in a 0SCF calculation. Normally, only the Cartesian coordinate and MOPAC Z-matrix geometries are printed, however other geometries can also be printed if other keywords are used, e.g. AIGOUT.