The user interface is interactive and enables the user to select the performance criteria and specify some of the parameter values (which will form the system constraints); it also displays the results of the recommended values for the other parameters. After selecting values for the required parameters, the new configuration can be tested using the simulation and monitoring subsystems, and each performance criterion can be measured and compared with the prespecified performance requirements, then, changes can be made to the tasks or the constraints if necessary, and the design subsystem run again to get new values. This design cycle is shown in Figure 28.
Figure 28: The optimal design cycle.