You usually start work in phase A. This phase lasts 52 weeks of work. All weeks in which you have worked are counted, regardless of how many hours you have worked. In phase A, you can get an unlimited number of temporary employment contracts from different clients and for different periods.
Both you and the client have a lot of flexibility in this phase. This is arranged through the agency clause. You can indicate that you want to stop working at any time and only have to report this one day in advance. The client can also terminate the assignment. Notice periods apply, which increase with your time in employment.
In phase A you can also work under a temporary employment contract without this agency clause. You will agree in advance to work with each other for a certain period.