We chose the contract net protocol (CNP) to let humans express their consent over the allocation of goals to UAVs in a realtime context. It raises a common level of automation (LOA) issue: how to make humans dependable in a realtime context. Most approaches are based on a deadline, like the sixth level of the Sheridan LOA classification. In order to properly design our implementation, we created our own LOA model : LOA5. We believe that this model can help to design any automatic system, regardless of the field. We present here this model