While avoiding evaluation or specification of individual companies, computer time-sharing commercial contract agreements are analyzed. Price and non-price contract elements are analyzed according to 22 evaluation criteria: confidentiality measures assumed by the vendor; consultation services available; package programs and user routines; languages supported by the system; availability and nature of documentation and user manuals; availability of instruction and training; existence of syntax check prior to compilation; advance notice of systems change; physical limitations of the programs; availability of storage; user file structure requirements; delay for user owned tape/disk mounts; number of users on the system; peripheral services; availability of immediate telephone assistance; availability of systems time; telephone network and location of computing equipment; back-up systems and excessive delays; systems crash recovery procedures; possibility of benchmark tests; preventative maintenance procedures; and history of the vendor, up-time, and customer references. A formula is presented for comparison of computer time costs. (Author/DW)