Technical and vocational education is offered to enhance students' practical skills at institutions usually accredited and approved by TESDA. Institutions may be government operated, often by provincial government, or private. They may offer programs ranging in duration from a couple of weeks to two year diploma courses. The vast majority are privately operated and most call themselves colleges.Programs can be technology courses like automotive technology, computer technology, and electronic technology; service courses such as caregiver, nursing aide, hotel and restaurant management; and trades courses such as electrician, plumber, welder, automotive mechanic, diesel mechanic, heavy vehicle operator. Upon graduating from most of these courses, students may take an examination from TESDA to obtain the relevant certificate or diploma.