商業流程的日益龐雜，如何提供有效且快速的流程建模和分析工具，是ㄧ項不可忽視的議題。針對不同階級的管理者或是使用者，所欲了解的流程廣度和細緻度亦不同。如公司內負責訂單流程的人員，該人員所在意的是訂單工作流程(Workflow)的細節，屬細部的商業流程;而公司的決策人員，如要進行公司產能擴充的方案，則必須從公司整個商業運作流程來考量，其所涉及的資料範圍則較廣。
然而，目前的商業流程建模工具，皆是以階層方式，將工作流程由簡至繁展開，欲建構商業流程者，必須先從大方向的概念思考起，一步步的將流程予以細部和實際化，最終便可完成商業活動中細部的工作流程。但若反向思考，若已存在一個細部的工作流程，是否有辦法可以讓龐繁的工作流程，經過處理後，變成簡化的流程且不失流程原來的意義，使流程可更加明確的傳達訊息。
因此，本研究希望可提供方法讓使用者可針對自我不同的需求進行細部工作流程的階層化(Hierarchical)，對龐大且複雜的流程進行逐步分析並且區塊化，使用者可藉由階層式的匯集，將繁雜的工作流程表達成功能樹(Function Tree)模式的商業流程，進而快速且明確的瞭解流程所欲表達的概念和意義。
在本研究中，以ARIS一商業流程建模工具繪製非結構化EPC流程，使用EPC Tools驗證工作流程結構的正確性，找出流程中的結構錯誤。而後將和有結構錯誤或是衝突之非結構化的工作流程予以改正。再利用對應控制元素(Corresponding control elements)的概念，告知使用者流程中可區塊的區域，而後將龐雜的流程予以階層化，進而表達成功能樹模式的商業流程。

With the increasing complicacy of business process, to offer an effective and efficient process modeling/analyzing tool is an important issue. By different class of management or user, the need of breadth and depth of process are also different. Like the staff who manages the order process, what he aims to is the detail order procedure. But if the staff is a policymaker, what he cares about is the general idea of the process, which can help him make decisions quickly.
At present, most of the process modeling tools applied hierarchical modeling concepts to construct a process. At first, from a general idea step by step expand a process to a detailed workflow. This kind of modeling used a simple to complicated way to build up a realizable and specific workflow.
In this research, an approach to allow have user have their own way to simplify workflow was proposed. User can hierarchically simplify workflow step by step and then transform complicated workflow into a function tree model. By using the function tree model, People can grasp the concept of the analzying process quickly and clearly. In order to reach the goal of the research, a software EPC Tool was used to detect the structure errors in EPC workflow and propose the rules to correct the structure errors. With using the concept of corresponging control elements, a workflow can be divided into different blocks. The final step was to find out where those blocks locate in and then to transform the workflow into a function tree model.

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