[Clinical evaluation of follow-up and disease course]

The clinical assessment of the evolution of Multiple Sclerosis (MS) is based on international criteria. For the definition of relapse and progression, the so-called Schumacher criteria (1965) may be chosen. For the definition of clinical subtypes (relapsing-remitting, secondary progressive, primary progressive, and progressive-relapsing), the criteria issued from a survey conducted by the group of Lublin (1996) are mandatory. One may be cautious to apply such research-driven sets of criteria to clinical practice. Many scales have been elaborated for the evaluation of the handicap caused by MS (i.e. neurological deficit, impairment, and "handicap"). None is perfect, but the Expanded Disability Status Scale (EDSS, Kurtzke, 1983) is widely used. Recent development in the elaboration process of scales ("scalology") may soon lead to the validation of new composite outcome measures.