After market research , mobile terminals especially , boundary and responsibility of gui system are determined . and from a configurative perspective , three subsystems are defined and their interactions are set down ; from a portative perspective , the hierarchic architecture of gui is devised 通过研究应用领域，尤其是移动通信终端领域，来确定系统边界，明确系统责任；在总体上，从可裁减性角度划定嵌入式gui的功能子系统及其交互关系，从可移植性角度设计嵌入式gui的层次体系结构；接着，具体设计实现gdi模块。
