營建工程的施工階段存在許多無可避免或不可預期的不確定因素，可能使作業施工日期延後，進而造成整體工程進度落後。因此，管理者或承包商須決定趕工計畫之可行性，趕工情況下可能導致成本增加、品質降低、意外風險提升等問題。本研究針對專案趕工之時間、成本、品質與安全等四項主要因素來分析趕工問題，以時間與成本建立雙目標權衡模式並加入品質門檻限制及作業安全成本考量，獲得權衡下兼顧品質及安全的最佳趕工決策。
本研究所提出之模式係以非線性函數考量時間與成本間之關係，相較於線性函數而言，更符合實際專案趕工時間與成本的合理關係。此外，考量專案執行過程可能面臨影響時間或成本之不確定性因素，使得模式求解結果不見得與實際情況完全相符，故本研究亦提出模糊趕工模式，將模糊理論導入模式中來處理趕工期間所面臨不確定性的時間與成本問題。

There are lots of inevitable or unpredictable uncertain factors that might happen during construction phase, which may cause consturction progress fall behind schedule. Therefore, project managers or contractors need to set a catch-up plan, which consider the costs additions, quality losses, and risk arising, that can be applied in the project. To find the suitable plan, this study focuses on the four main factors, which are duration, costs, quality, and safety, using these main factors to analyze the project compression problems. Furthermore, this study propose a time-cost trade-off model and also take the quality performance threshold and costs of safety into consideration. As a result, the trade-off solution might take both quality and safety into account, making sure that the construction project will proceed smoothly.
This study consider the time-cost relation via non-linear function. It’s more reasonable than using linear function to calculate the costs related on duration. Additionally, to correspond with the practice, this study also import the fuzzy set theory into the model, making sure that the linguistic description can be applied to it. That is, the proposed fuzzy model can output fuzzy cost and time solutions to face the uncertainty in practice during the crash duration.

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