There is no single qualification to becoming a consultant, other than those laid down in relation to medical, psychological and engineering personnel who have attained this level-degree in it or professional licenses. Consultants may hold undergraduate degrees, graduate degrees, professional degrees or professional designations pertaining to their field(s) of expertise. In some fields, a consultant may be required to hold certain professional licenses (e.g., a civil engineer providing consulting on a bridge project may have to be a professional engineer).