In recent years, unions and labour rights organizations have reported an increasing use of successive short-term employment contracts - or in many cases, no written contracts whatsoever. The use of successive short-term contracts has been used to deny workers statutory benefits and bonuses, and to undermine worker organization. Not only are contract workers always in danger of losing their jobs, while they are employed contract workers don't have the same rights as permanent workers, such as maternity leave, annual leave, or wage increases that would accrue with seniority at the factory.