近年來由於世界貿易快速成長，市場趨於全球化。電子製造業在經營上面臨成本、品質、交期短與彈性製造之競爭壓力下與日俱增，電子產業利潤不斷降低，顧客的要求卻越來越多。為達成廠商顧客雙贏的目標，本研究以電子裝配業-投幣器如何提升生產效率作為研究主題，探討如何將生產資料、顧客需求量、生產週期、在製品間的互動關係使用模擬方式設計分析，以求出適當的生產流程系統，以使生產系統具備低在製品水準(Work-in-process ,WIP)、短生產時間週期，且滿足需求量之現場流程管制要求，期望讓投幣器生產過程更符合經濟效益。本研究方法以靜態的IDEF0將複雜的系統清楚呈現出來，然後使用CONWIP
（Constant Work in process）系統具有易於控制、低在製品水準、以及穩定之生產週期等優點，建立生產控制系統。最後使用動態電腦模擬驗證方法找出投幣器符合經濟要求之生產流程作業模式。利用此程序可以確認生產模式運作情形是否符合真實系統狀態或決策者期望達成的程度，以協助生產決策者有效達成生產績效。
加工時間變異對電子組裝作業有一定程度之影響。本研究透過改變標準差（變異）分析在標準差減半、標準差為零、原始標準差三種作業環境之下，使用CONWIP對系統績效影響程度。研究顯示隨著標準差變異程度提高，對系統績效也急遽壙大，並且使生產週期時間延長，結果發現產出量降低。因此，想要一個穩定的CONWIP生產系統，就必須致力於將加工時間的變異性變小。
關鍵詞：IDEF0、CONWIP系統、系統模擬、生產週期

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