由於製造業在生產的過程中常常面對複雜的排程計畫以及現場的不確定狀況，使其在應用ERP或SCM系統時，因缺乏有效的現場管制功能而無法發揮這些系統的整體效能。因為排程問題是現場管制系統的核心，尋找有效且快速求解排程問題的方法是開發現場管制系統成敗的關鍵。過去十年間，針對零工式生產排程問題的研究上已有許多傑出的成果，但我們發現過去研究中所使用的零工式生產排程問題與現場實際的問題之間有許多差異，因此這些研究成果並無法完全由現場所使用。
本研究所強調之現場零工式生產排程問題包括兩個主要特性：1、每一工件可以擁有不等之操作數目，2、事先知道某些機器為瓶頸機器。這是相對於過去研究中的零工式生產排程問題皆假設每一工件會使用每一機器，因此其所產生的問題將使每一工件擁有相等之操作數，且每一機器的重要性皆相等。針對這兩個主要差異，本研究設計兩個實驗：實驗一產生工件擁有’等操作數’與’不等操作數’的問題；實驗二產生現場’無瓶頸機器’與’有瓶頸機器’的問題。在每一實驗中，我們以三個因素：機器使用率、交期設定和操作時間變異，模擬產生12種不同的狀況。然後以7種評量準則比較16個常用的派工法則在不同狀況下的表現。
研究結果發現，在’不等操作數’以及’有瓶頸機器’的生產排程問題中，派工法則的表現確實與其在’等操作數’以及’無瓶頸機器’的問題中的表現有極大的差異。本研究將這些其差異加以分析，並嘗試整理出一些規則以提供現場的使用者在面對不同狀況下選擇適當之派工法則的依據。我們相信本研究的成果不論對理論研究者、現場工程師、或生管軟體系統開發者都有極大價值。

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