Proficiency in a foreign language is required for many careers such as journalism, social work, international business (sales, management, banking, import-export), government service (customs and immigration, foreign service, CIA), teaching, interpreting, business, law and tourism. Language skills can often be the deciding factor in landing a job when in competition with equally qualified but monolingual peers. Mastery of one or more foreign languages is also useful and often required for students seeking a master's or doctoral degree.