Summary: This is a proposal of the Movement Disorder Society for a clinical classification of tremors. The classification is based on the distinction between rest, postural, simple kinetic, and intention tremor (tremor during target-directed movements). Additional data from a medical history and the results of a neurologic examination can be combined into one of the following clinical syndromes defined in this statement: enhanced physiologic tremor, classical essential tremor (ET), primary orthostatic tremor, task-and position-specific tremors, dystonic tremor, tremor in Parkinson's disease (PD), cerebellar tremor, Holmes' tremor, palatal tremor, drug-induced and toxic tremor, tremor in peripheral neuropathies, or psychogenic tremor. Conditions such as asterixis. epilepsia partialis continua, clonus, and rhythmic myoclonus can be misinterpreted as tremor. The features distinguishing these conditions from tremor are described. Controversial issues are outlined in a comment section for each item and thus reflect the open questions that at present cannot be answered on a scientific basis. We hope that this statement provides a basis for better communication among clinicians working in the field and siimulates tremor research. Key Words: Tremor-ClassificationClinical assessment.The present effort has been undertaken to create a common terminology for tremor disorders within the Movement Disorder Society (MDS). The article was discussed during the symposium on tremor in Kiel, Germany, subsequently distributed within the Scientific Issues Committee of the MDS, and finally approved by the EXCO of the MDS. One goal of the MDS is to foster such consensus statements. We hope that this article will be the first of several to be published on different issues.Authorities in the field of tremor differ in their views of tremors because similar observations are interpreted differently. It cannot be the intent of this article to solve all of these controversies because scientific data are lacking for many of them. However, it is our goal to summarize the minimal consensus, to address the controversial issues, and to provide a framework in which unresolved questions can be addressed. Tremor can be classified in different ways. Because of the numerous etiologies for tremor. a practical etiologic classification or a valid physiologic classification is not available. Therefore, the gold standard for tremor research remains clinical classification. We propose to classify tremors according to the traditional approach of clinical neurology. Based on their specific clinical features, tremors are grouped into syndromes that can be separated on the basis of clinical observations alone. This article is based on the assumption that different components of tremor can be separated by clinical observation and need to be described with a common terminology (see 1.1, Definitions of the Phenomenology of Tremor). To achieve this objective, the meaning and interpretation of some tremor-related tests must be defined (see 1.2, 2