Some admission is limited by spaces available, and by selection criteria.
Students who achieve specific grades in AP courses will receive credit or advanced standing in university courses. These programs usually lead to 2-year diplomas, or are less than a year's duration and lead to certificates. Students must be employed in a trade area and become registered through their employer. Certificate programs usually require up to one year of study. Traditional approaches to distance delivery of courses have involved the use of printed materials, television broadcasts, audio tapes, teleconferencing, tutorial contact, seminars, labs, and examinations.