other allowances include process allowance which is to cover when an operator is prevented from continuing with their work, although ready and waiting, by the process or machine requiring further time to complete its part of the job. a final allowance is that of interference which is included whenever an operator has charge of more than one machine and the machines are subject to random stoppage. in normal circumstances the operator can only attend to one machine, and the others must wait for attention. this machine is then subject to interference which increased the machine cycle time.