USGBC has not made clear the exact requirements for a permanent monitoring system. One contributing approach, however, is to administer a survey, as this is often easy and cheap to implement. Additional approaches could be a building automation system if sensor locations are adequately distributed throughout occupied spaces, and air speed and radiant temperature testing with the use of handheld meters or other monitoring equipment. See LEED-EBOM IEQc2.3 for additional ideas on permanent monitoring systems.