What is BULATS? The Business Language Testing Service (BULATS) is a language assessment service specifically for the use of companies and organisations. BULATS is for organisations which need a reliable way of assessing the language ability of groups of employees or trainees. The service is designed to test the language of employees who need to use a foreign language in their work, and for students and employees on language courses or on professional/business courses where foreign language ability is an important element of the course.