A field experiment of 143 employees explored the effects of realistic versus optimistic computer training previews on trainee learning, satisfaction, and post-training reactions. We argued that optimistic previews would result in enhanced outcomes during the training program, while realistic previews would result in enhanced post-training reactions. The effects of relevant individual differences (i.e., cognitive playfulness and software efficacy beliefs), and mediating factors (i.e., attention to ones performance evaluation and flow) were also examined. The results showed some support for our expectations.