As before, the rates are set according to industry data on properties meeting certain fire safety standards that fall within the mid-price range of available lodgings for Monday-Thursday travel over a 12-month period ending in March. GSA meanwhile said it is going to form an interagency working group to study one aspect of the methodology: how it draws the boundary lines for areas with specified lodging rates. The general policy currently is that those boundaries follow county lines, meaning that the rate applies to an entire county no matter how far the actual place of lodging is from the associated city area. In other cases, though, cities are considered separate entities from the counties that surround them and the rate applies only to the city. By contrast, the system of determining boundary lines for GS locality pay purposes generally uses standard statistical measures of metropolitan areas.