An exploratory study of the factors underlying vocational teachers' attitudes toward using microcomputers to supplement inservice education found that two factors (the teachers' belief in the educational value of microcomputers and their confidence in using the computers) accounted for about 44 percent of the variance in their attitudes. Data were collected by mailed questionnaire from a computer-generated random sample of 350 vocational teachers drawn from a frame of 1,341 vocational teachers in central Ohio. The return rate of usable questionnaires was 72 percent. The questionnaire consisted of 37 items to which the subjects could respond on a 5-point Likert-type scale. (Abbreviated examples of the items are as follows: "Microcomputer use should be encouraged"; "Microcomputers create problems"; "I wouldn't want to use microcomputers"; "Using microcomputers adds interest"; "Microcomputers can help individuals acquire knowledge"; "Microcomputers are too complicated to use"; "I'd be willing to send electronic messages"; and "I know about commercially produced computer programs.") Factor analysis of the data was conducted. The researchers recommend that teacher educators planning inservice education programs ensure (through practical examples and application of microcomputer use for teaching and learning activities) that teachers understand the value of microcomputers and that they reinforce the teachers' confidence in computer use by demonstrating how microcomputers can be used in computer conferencing and electronic mail. (Contains 20 references.) (CML)