Since 27 December 2004, which was a day after Tsunami disaster happened in Aceh, SHEEP has been very active doing communication with various national NGOs, especially WALHI and Christian NGO Network (JK-LPK) that have community basis in Aceh and Nias. Communication that SHEEP did was more aim at consolidating any possible actions that could be done together among NGOs in order to respond the Tsunami disaster that victimized thousands people. Fortunately, with existing resources, although very limited, JK-LPK in Sumatra Region and WALHI Aceh could do preliminary assessment on 28 December 2004.