A plan is provided for a lesson on disk operating systems (DOS) for managers. Twenty-five lesson objectives are listed, followed by suggestions for learning activities and special resources. In the presentation section, key points and content are provided for 25 instructional topics that correspond to the 25 lesson objectives. The topics are as follows: hardware, hardware and software definitions, disk operation systems, bootstrap procedures, DOS command types, common filenames and extensions, general format DOS commands, disk and disk drives, FORMAT, disk handling techniques, changing logical drives, DIR command, TYPE command, creating and deleting subdirectories, changing directories, copying files, erasing files, proper file management techniques, the prompt line, COMMAND.COM and AUTOEXEC.BAT, COM: and LPT1:, redirection of standard input/output, batch files, how to run an unknown program, and other DOS commands. A DOS feedback instrument (student evaluation), master feedback instrument (answer key), and DOS attitude feedback instrument are also provided. (YLB)