營造業承包廠商自辦外包規模決策評估模式之研究

A Decision Support Model for Construction Job Outsourcing

對營建業生產部門而言，不論是上游的營造廠亦或下游的分包商、專業承包商等，在業務上均須面對營建資源自辦或外包的決策問題，因為它們是影響營造業生產過程投入成本之主要因素之一。目前國內營造業多以經驗模式或以簡單的傳統方式來評估與決策相關問題，此等評估方式往往無法完整考慮到模式內各項影響自辦外包之成本因子，以致難以真實的評估模式內資源的成本架構。本研究針對此問題，利用數學規劃理論構建數個適合國內營造業的整數規劃模式，並利用數學規劃軟體求解，以期幫助實務面決策者有效解決營建業資源自辦外包決策問題。為評估此等模式之實用性，本研究利用實際工程的資料進行實例測試，初步結果頗佳，應可為實務界參考。

Construction contractors, either general or specialty, often need todecide on the extent of job outsourcing or subcontracting on a project,which typically affects their capital investment in projects and theirprofitability as well. It is imperative that contractors consider all thenecessary factors in order to make proper decisions. Conventionally,decisions are made based on engineering experience and judgment, whichlacks systematic analysis and could lead to inferior results. Therefore, inthis research we aim to develop several decision support models, which areformulated as integer programs, to assist construction contractors indetermining the extent of job outsourcing or subcontracting. Theseprograms are solved using mathematical programming software. Toevaluate these models, we performed case studies using data from realconstruction contractors. The preliminary results are good, showing that themodels could be useful for real practice.