競爭環境激烈的時代，企業為求生存必須建立各種為達成企業願景的目標，並且在企業發展的過程中逐步建置各種資訊系統以支援企業目標的達成。然而隨著競爭環境的變遷，企業也必須不斷修正目標以維持企業競爭力，但是資訊系統是否仍能持續支援修正後的目標？由於資訊系統的修改並不容易，且成本極高，因此往往在多年之後由於企業目標或企業流程的改變而使得資訊系統的效率不如從前。另方面也有可能修正後的企業目標由於資訊系統的缺乏彈性而無法得到資訊系統的支援。

本研究主要目的在發展一種以企業目標為導向的資訊系統評估方法，檢視目前企業已運作中的資訊系統支援企業目標的程度。本方法在評估之前先擷取企業目標及企業中支援企業流程之資訊系統，以使用個案(Use case)為評估工具，並將評估的結果以量化的數據及圖形說明企業資訊系統與目標之間的關係。使用本評估方法所得到的結果，將有助於企業管理者在發展資訊科技決策上的參考。

Under the severe competition environment, it is very important for enterprise to create various goals and install process oriented information system to support it to reach business visions on business growth and expansion. For keeping the enterprise competitive advantage the business goals needed to be modified continuously under the change of competition environment. But the business information systems could still support the modified business goals? Information system could become less efficiency than before after business goals changed.

The purpose of this study is to develop a business goals oriented information system evaluation approach to understand the degree of information system supporting the business goals. The approach first abstracts business goal and process oriented information system by business management methods and utilizes use case as the evaluation tool. Quantitative index and diagram as the result of evaluation explains the relationship between business goals and information systems. The results of evaluation could provide advantages on the information technology decision making for business leaders.

CHAPTER 1 Introduction ----------------------------------------1
1.1 Background -----------------------------------------------1
1.2 Research Motivations and Objective -----------------------2
1.3 Research Process -----------------------------------------4
1.4 Organization of the Thesis -------------------------------4

CHAPTER 2 Literature Review -----------------------------------6
2.1 Business Visions and Goals -------------------------------6
2.1.1 Significance of Business Visions and Goals -----------6
2.1.2 Business Goals Model ---------------------------------7
2.2 Management by Objectives --------------------------------10
2.3 Use Case Overview ---------------------------------------15
2.3.1 UML -------------------------------------------------15
2.3.2 Use Case Diagram ------------------------------------15
2.3.3 Interaction Courses and Scenarios -------------------19
2.3.4 Use Case Descriptions -------------------------------20
2.4 Value Chain Analysis ------------------------------------22

CHAPTER 3 Framework ------------------------------------------25
3.1 Evaluation Structure ------------------------------------25
3.2 Business System -----------------------------------------27
3.2.1 Business Goals --------------------------------------27
3.2.2 Business Goals and Use Cases ------------------------28
3.3 Information System --------------------------------------29
3.3.1 Information System Goals ----------------------------29
3.3.2 Information System Goals and Use Cases --------------30
3.4 Use Case ------------------------------------------------31
3.4.1 Use Case Descriptions -------------------------------31
3.4.2 Classes, Attributions and Operations ----------------32
3.5 System Evaluation ---------------------------------------33

CHAPTER 4 Implementation -------------------------------------38
4.1 Introduction of Taiwan Power Company --------------------38
4.2 Business System -----------------------------------------40
4.2.1 Business Goals --------------------------------------40
4.2.2 Business Goals and Use Cases ------------------------42
4.2.3 Use Case Descriptions in Business System ------------43
4.2.4 Classes in Business System --------------------------46
4.3 Information System --------------------------------------50
4.3.1 Information System Goals ----------------------------50
4.3.2 Information System Goals and Use Cases --------------52
4.3.3 Use Case Descriptions in Information System ---------53
4.3.4 Classes in Information System -----------------------55
4.4 System Evaluation ---------------------------------------60

CHAPTER 5 Conclusions and Future Research --------------------70
5.1 Contributions -------------------------------------------70
5.2 Limitations ---------------------------------------------70
5.3 Future Research -----------------------------------------71

References ---------------------------------------------------72

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