For EB1-Multinational Executive or Manager petition ( EB1C), the petitioner must establish that the beneficiary was employed abroad in a qualifying managerial or executive position for at least one out of the three years prior to his entry to the United States as a nonimmigrant to work for the same employer. 

For a EB1C case, a detailed description of job duties is the key to determine the true nature of the employment. Without the necessary information, USCIS cannot conclude that the beneficiary was employed abroad in a qualifying managerial or executive capacity.