physical model实体模型.ppt

Chapter 1 Players in the Systems Game Process Modeling 什麼是systems modeling系統模型、邏輯vs.實體模型logical and physical system models 什麼是process modeling處理模型，why? Process modeling基本觀念和架構。 閱讀並說明data flow diagram資料流程圖。 解釋何時繪製Process model (處理模型)以及將它們儲存在哪裡。 建立context diagram(環境關聯圖)來說明系統與其環境的界面。 指出系統的使用案例use cases 、外部的和暫時性的業務事件external and temporal business events 。 建製功能分解圖functional decomposition diagram 。 繪製事件圖，然後將這些事件圖合併成系統圖。 繪製最低層資料流程圖，並使用資料結構和程序性邏輯（結構化英文和決策表）分別描述基本資料流和處理。 使用 CRUD 矩陣表同步整合資料和處理模型。 Chapter Map Models: Logical and Physical邏輯與實體模型 Logical model邏輯模型 – a nontechnical pictorial representation that depicts what a system is or does. Synonyms or essential model, conceptual model, and business model.偏向概念、業務面 Physical model實體模型 – a technical pictorial representation that depicts what a system is or does and how the system is implemented. Synonyms are implementation model and technical model.偏向技術及建置面 Why Logical System Models? Logical models remove biases that are the result of the way the system is currently implemented, or the way that any one person thinks the system might be implemented.消除對現行作業或未來建置方式之偏見 Logical models reduce the risk of missing business requirements because we are too preoccupied with technical results.降低因為太專注於技術性的細節而遺漏業務需求的風險。 Logical models allow us to communicate with end-users in nontechnical or less technical languages.較可以非技術性的語言來與使用者溝通 Process Modeling and DFDs Process modeling – a technique used to organize and document a system’s processes. Flow of data through processes Logic Policies Procedures Data flow diagram (DFD)資料流程圖 – a process model used to depict the flow of data through a system and the work or processing performed by the system. Synonyms are bubble chart, transformation graph, and process model. DFDs have become a popular tool for business process redesign.企業流程再造 Simple Data Flow Diagram Differences Between DFDs and Flowcharts和流程圖的不同 Processes on DFDs can operate in parallel (at-the-same-time)可以平行地作業 Processes on flowcharts e