These measures might also influence recreation or its indicators. They include natural and socio-economic criteria (e.g. the right to access forests for recreation or fostering cultural traditions, or management of forests with regards to non-timber products). Several case studies and nationwide surveys conducted by the Thuenen Institute and others prove that forest-based recreation is valued and appreciated by the general population. Recently a study about economic valuation of non-market goods provided by forests (e.g. the possibilities for recreation for the general public) was conducted by the Thuenen Institute (Elsasser & Weller 2013). In the study actual willingness to pay values for forest-based recreation are presented, elicited in a nationwide contingent valuation survey.