Abstract This thesis is based on a case study of the drawn out legal process on the question of establish a limestone quarry in Bunge Ducker in north Gotland (Sweden). The current fields are located next to areas that are protected by virtue of being EU-certified Natura 2000-areas. Despite this, the Swedish governments and courts have not agreed in witch national interest that should be prevail when decisions are made on this issue. This phenomenon are reflected in the judicial process and different court have evaluate information differently in the case. A change among governmental actors where priority is given to the importance of national interest have occur in the later part in the process. This bachelor thesis in political science will search for explanation for the policy change in the dispute of establish a limestone in Bunge Ducker with help from the Advocacy Coalition Framework (ACF). Keywords: Bunge Ducker, policy change, ACF, national interest