For many years, the need to develop valid tools to evaluate signs and symptoms of Parkinson Disease (PD) has been present. However the understanding of all intricacies of rating scales development was not widely available and the first attempts were relatively crude. In 2002, the Movement Disorders Society created a task force to systemize the measurement of Parkinson's Disease. Since then, the Task Force has produced and published several critiques to the available rating scales addressing both motor and non-motor domains of Parkinson Disease. Additionally the task force initiated a project...