Using fixed-term contracts can be the best way for your business to keep the budget balanced while moving important projects forward. By exercising caution, your company can avoid any violation of workers` temporary rights. This means reducing risk and liability, while maintaining all the benefits of fixed-term contracts. (a) restrict, for a specified period, the use of contracts to cases where the employment relationship cannot be permanent, either because of the nature of the work to be performed, or the circumstances in which it is to be performed, or the interests of the worker; Under no circumstances may a fixed-term contract be used in the long term to fill a position related to the usual and sustainable activity of the company. A casual employee works intermittently or irregularly for you, for example.B.