This volume reproduces the various criteria agreed upon by the European Neuromuscular Centre (ENMC), covering the various forms of muscular dystrophy, myotonic dystrophy, non-dystrophic myotonias, spinal muscular atrophy, familial ALS, Charcot-Marie-Tooth disease, mitochondrial and rare congenital myopathies, congenital myasthenic syndromes and post-polio muscle dysfunction.