Local knowledge involves both the staff doing the inventory as well as external knowledge. Secondary data can be from many different sources, for example municipality plans, regional plans, national inventories, local organizations and authorities. Field visits are done when local knowledge and secondary data are not sufficient for an appropriate judgment. Special emphasis is also given to forests in the proximity of second homes, schools, health care facilities, and frequently visited places [e.g. beaches, lookout points, rest areas, trails, golf courses and tourism infrastructure).