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Operator's activities at CRT terminals: a behavioural approach.

A study was carried put to analyse the consequences on clerical operator's activities of the inclusion of VDUs. A behavioural research approach was taken during the whole working period. The results show a very strong reorganization of visual focusing and of visual exploratory patterns as a result of internal modifications induced both by the task and by the duration of the worktime. On the other hand, while production indicators were quite consistent, variations of working strategies and of accessory activities such as postural readjustments, automanipulative gestures, verbal and non-verbal behaviour were observed during the workday. It can be assumed that, in response to the working strain, the human operator makes some adjustments to work patterns in order to prevent deterioration of performance. The variations of behavioural strategies affect not only the primary activities but also the secondary ones because the operator cannot control the production rate or the processes of execution in systems invo...