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A previous report, asserted the need for man-machine interface (MMI) requirements definition and guidelines in the design of computer-based information systems. The present report extends the treatment of that topic. An initial hierarchic list of functional MMI capabilities, previously proposed for use in requirements definition, is here doubled in size to over 400 items, and has been reorganized to improve its structure. Initial design guidelines proposed for data entry functions are here revised and enlarged to include 79 items. Another 131 guidelines are proposed for sequence control functions. A continuation of guidelines development is recommended, in collaboration with other concerned organizations and agencies.