Every employee must have a written employment agreement. It can be either a collective agreement (between employees, employers and unions) or an individual agreement (between an employer and employee).
These are things that must be included in employment agreements by law:
the names of the employer and the employee
a description of the work to be performed
an indication of the place of work the agreed hours or an indication of the hours that the employee will work
the wage rate or salary payable and how it will be paid
a plain explanation of how to help resolve employment relationship problems including advice that personal grievances must be raised within 90 days
a statement that the employee will get (at least) time-and-a-half payment for working on a public holiday
any other matters agreed on, such as trial periods, probationary arrangements, or availability provisions
the nature of the employment if the employment is fixed-term.