xsd:string An Agent is involved in an activity whose degree of success is dependent on a parameter of the action matching a particular set of values of a continuous variable or variables (e.g. quantity, location, time). The Agent, or metonymically the Instrument or Means action, is described in terms of the actual or expected Deviation between the location, time, or quantity in the activity and the location, time, or quantity which is necessary for the intended event. The Longview Rangefinder is accurate to within one foot per hundred yards . His estimate was off by an order of magnitude . The fork truck operator must be fairly accurate in his aim. The precision of the daily measurements is dependent on a number of factors.