Implementation size of a software package implementation can be determined by determining implementation sizes of modules, determining tasks to be implemented, determining a complexity factor, and calculating the implementation size based on the modules, tasks, and complexity factor. In the single embodiment or in some embodiments, the system comprises a control center comprising a command control logic module and a communication interface configured for wired or wireless communication between the control center and the remote module. The spring pushes the movable body in a direction away from an internal bottom of the case. In some embodiments, the present invention involves using a personal identification number or string as an additional security measure. The continuous cooking surface, the combustion chambers, the burners and the valvular means constitute a cooking unit that is removably mounted on a supporting cart suited to house said portable tank and to allow the use of the apparatus either in an indoor or in an outdoor environment.