Investigation of the epidemiological factors associated with amyotrophic lateral sclerosis (ALS) in Israel with a view to future international collaboration. Particularly addressing:- 1. Differences between ethnic subgroups 2. Differences between immigrant and native-born populations 3. Differences according to military service profile Clinical features gathered at each routine visit ,throughout the entire course of the disease, will be recorded in database format, in order to correlate with potential epidemiological factors.