Operators monitor and control the plant system on video display units (VDUs) in a digital control system (DCS) of a nuclear power plant. Before VDUs, operators monitor and control the plant. For this, operators need to do interface management task to arrange the computer screens and navigate on them. Interface management tasks may consume some part of the cognitive resources and impair the primary task. This alteration not only changes the cognition of the operators, but also how they follow the procedures. The crew structure and distribution o...