Multiple sclerosis is an unique disease with a tremendous impact on social life in countries with moderate climates. Its cause is unknown. In recent years however hopes have been raised that the disease might be fought, and possibly cured. With the disappearance of poliomyelitis as the main paralyzing disease multiple sclerosis has taken its place as the single disease that is responsible for paralyzing the young with an incurable affliction of long duration, for social disruption and for an 1 economic impact that is estimated to be higher than heart disease • A multi-national, mUlti-disciplinary approach to this extremely disabling disease is urgently needed in this phase of hopeful scientific developments. The Commission of the European Communities therefore sponsored a Con ference on Multiple Sclerosis Research in Europe on 29,30 and 31 January 1985 in Nijmegen, The Netherlands, with the aim of formulating practical proposals for such cooperation in the Communities. This volume contains the papers read at that conference.