On the occasion of a concentrated lecture by computer training, which was delivered in the former period of 1985, an inquiry was made into subjective fatigue symptoms of 81 students of 2 classes in order to grasp their condition of fatigue due to VDT performance. The results obtained are as follows: 1) Higher rate of complaining of symptoms before the training and smaller difference in the rate between pre-and post-training compared with Yoshitake's results presumed immobilization of fatigue symptoms especially in the group I. 2) Examination of the ordinal relationship of the rate of complaining of symptoms among 3 groups revealed the general type, i.e. I-dominant type on the third day of training except for II-dominant type (mental performance type, night work type) before training. 3) The present inquiry revealed no correlation between the duration of VDT performance and the post-training rate of complaining of symptoms for the group II, presumed a small amount of mental fatigue due to the concentrated lecture. 4) Increased rate of complaining of symptoms after the second day of training, having much lecture time (less time of VDT performance) for the group II presumed mental fatigue due to the lecture, taking notice of the condition of fatigue in the daily life represented by repeated general lecture. 5) Increased rate of complaining of symptoms on the third day of training compared with that for pre-training for the group II presumed inadequate recovery of the mental fatigue due to the lecture on the second day of training. In this connection, it is hoped that due improvement should be made in the way of time-spending after training in the daily life.