Book excerpt: The ultimate reference book : the 5th updated edition of the famous “blue guide”. Incluided : A DVD with new sequences completes each chapter! Epileptology changes. The syndromic approach is completed by an etiological approach, based on the major advances in genetics and functional genetics. New entities have found their place, and a purely descriptive, “electroclinical” approach is no longer adapted in many circumstances. The 5th edition of the Blue Guide includes the most recent advances. It was necessary to justify the physiological, epidemiologic, genetic and therapeutic approaches and to consider them in the light of the new classification efforts, which are still in the making. Nevertheless, the description of epileptic syndromes, both classical and recent, remains at the core of this book.