Cognitive dysfunction can have a dramatic impact on a subject's QoL, influencing the fulfillment in work and social life, independently from physical disability. The methodology of cognitive status assessment in MS is based on established sets of tests, which could be conduced by qualified neurophysiologists. There is a need of simple test that could be quickly conducted by every physician, providing information of cognitive status/ or one of its parameters (attention/concentration). That kind of information could be immediately used by the physician during the visit to adjust the way of taking history or giving advices to subjects.