- 學位論文
以六標準差分析執行採購專案需額外工程變更之個案研究
Using Six Sigma to analyze the implementation of procurement projects with extra engineering modifications: A case study
摘要
公司工程發包案件易因工程變更發生工程追加，若設計變更致使追加之金額在原發包金額之2-3%尚可接受，倘若發包案件追加之金額皆超過原發包金額之30%-50%，顯見其採購發包計畫之執行流程不夠謹慎。基於公司政策之時程要求，各工程相關單位應遵照工程需求之目標要求期限內，依工程之特性及環境訂定各作業及施工階段應完成之期限內辦理招標之流程與作業辦法有檢討之處。 本研究採用過六標準差分析個案公司在工程發包工程變追加經費之原因，經分析發現主要在於前置作業就需求單位與執行單位，管控節點與發包主導單位之溝通不足，其必須透過一定管控之程序作為前置作業之要點，避免後續一再設計變更。另就採購單位於擬定底價時，建議以量化基礎之成本分析法拆解供應商之報價來訂定，最終於績效衡量上，本研究證實改善後的採購流程能大幅降低工程變更追加經費之發生。
並列摘要
Company's outsourcing projects have frequently ended up with unexpected additional projects. The change of designs results in extra cost by 2-3% of the total cost, leading to be still acceptable for project managers. However, if the extra cost is more than by 30-50% of the total cost, the project managers would not do a great job on outsourcing projects.Due to the project due date, all of the relevant units of the case company shall comply with the targeted requirements within the time frame. The procurement procedures and methods shall also be reviewed within the time frame for the completion of the entire operations and the construction tasks. This study used six sigma to analyze a procurement outsourcing project with extra engineering modifications for the case company.After the analysis was conducted, the result showed that the main reason was that there lacked of communications between the requested unit and the execution unit.Therefore, the case company modified the procurement process and enforced the initial procurement control operation in order to avoid an additional change of designs, leading to the extra cost. For the project budget, this study recommended that the procurement staff should adopt the quantitative methods to perform a cost analysis based on the suppliers’ price. After the improved process was implemented, this study showed that the modified procurement process could reduce the frequency of the substantial cost incurred by the change of designs.