This study investigated the effects of integrated computer based instruction (CBI) practice on criterion task performance and attitudes of learners. The 22 subjects--11 in a treatment group and 11 in a control group--were 16 Boston College undergraduate and graduate students and 6 professional instructional designers of computer based instruction. All subjects took a computer assisted instruction (CAI) lesson that taught them to use a communications software package to transfer files between a personal computer and a VAX computer. The experimental treatment lesson included an additional section that allowed subjects to practice the task without initial instructional prompts. Each subject then used the software package to do the file transfer task. Subjects who took an additional practice section completed the file transfer in, on average, half as long as the subjects who did not have the practice section, and made fewer errors. Results showed only a slight difference between control and treatment groups on total attitude score. However, subjects in the control group were much more likely to indicate a desire for additional review than subjects from the treatment group. Eleven references and related readings are listed. (Author/LMM)