In recent years, the Government of Ethiopia has given special attention for the development of irrigation schemes in order to attain its goal of food selfsufficiency. The government s commitment for the development of irrigation system has been shown through its Water Sector Development Plan. In response to this government s commitment, different irrigation schemes were planned and implemented by the government. Koga Irrigation Project, the country s first type large scale irrigation scheme for small farmers, is among the irrigation schemes constructed by the government. The objectives of this study are: Evaluating the extent of beneficiary farmers participation in the MOM of large scale irrigation scheme; Examining the willingness of beneficiary farmers to participate in the MOM of large scale irrigation scheme; and Identify external factors that affect the willingness of beneficiary farmers to participate in the MOM of large scale irrigation schemes.