Unlawful termination encompassed several parts; notice of termination, Centrelink notification, and prohibited reasons. Under Section 661 of the Act, employees, other than excluded employees (including casual employees with less than 12 months' regular ongoing service, apprentices) were required to be given a specified period of notice of termination or payment in lieu of this notice. Where this was not provided to an employee, an unlawful termination application could have been lodged. In certain circumstances where a business terminates 15 or more employees, the business needed to give written notice to a body prescribed by the "Workplace Relations Regulations 2006", currently Centrelink.