An attack is a patient reported description of an episode or syndrome, either currently present or from an experience in the past.

Objective Clinical Evidence OCE can be a current observation by the neurologist or determed earlier by any medical doctor.

Dissemination in Space DIS is provided by an MRI showing lesions in different spaces as described in DIS_scheme.

Dissemination in Time DIT is provided by lesions as described in DIT_scheme.