You are asked to design a new bus service system for Arkansas State University as an engineering manager. Please provide a functional flow diagram based on the following description. Need identification and system requirement are the first two steps. Both the service system and support system need to be designed. After design integration and testing, the system is built, which includes buying the buses, building the bus stations, establishing the management group, and recruiting and employing the drivers. At the same time the support system is built. After everything is done, the service system is under operation. Every morning, all buses are checked. The buses without any problem are allocated to different lines with drivers and are under service. The buses with problems will be sent to the university garage at first for the detail check. If the problem is small, the garage fixes the problem, and the buses go back for operation. The buses with serious problems are sent to some external garage for repair. Please make the reasonable assumption and think about the level, sequence, relationship of the activities based on your common sense. $($Hint: to save time, if possible, some concurrent engineering concepts should be applied$).[10$ points$]$