Cognitive impairment affects up to 65% of multiple sclerosis (MS) subjects, especially
executive functions. The California Card Sorting Task (CCST) assesses specific components of
problem-solving ability. There is currently no French version of this test. Reims
neurological department in collaboration with Rothschild Foundation has developed a French
adaptation of CCST. This version includes three cards packages with two alternate forms to
control practice effects (test-retest). In order to assess "test-retest reliability" we have
to verify the comparability of the three cards packages within one session in MS patients.