The employer consults the employee about the notification (and, if accepting, discusses full-time or part-time status, hours and start date) and gives a written response within 21 days that accepts it, stating whether the employee becomes full-time or part-time, the hours of work and the day the change takes effect (the first day of the first full pay period after the response unless otherwise agreed, s 66AAD), or does not accept it with reasons. Non-acceptance is permitted only because the employee still meets the s 15A casual definition, because of fair and reasonable operational grounds (substantial changes to how work is organised, significant impacts on operations, or substantial changes to terms needed to comply with an instrument), or because accepting would breach a legally required recruitment process. Disputes are first discussed at the workplace, then may go to the FWC, whose orders must be complied with (ss 66M, 66MA).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.