過去傳統穩定競爭環境中，廠商認為只要不斷擴大產能製造產品，而廠商僅須專注其本身製程上是否達到經濟規模，壓低成本即可，不需要考慮顧客需求。但產業環境已改變，首先，對於顧客對採購決策及訂單本身之要求日趨嚴格，製造商非僅面臨容易預測且穩定的規律訂購訂單，尚有突發之非規律訂購訂單，故製造業者無不竭盡心力於生產的規劃，應整體考量上述顧客的需求型態並納入生產策略之制定。因此，本研究考量下游零售商之訂購策略，進而於建構模式時能夠了解製造商其所面對的下游顧客或零售商不確定性之需求型態，內容包含（一）規律的訂購，本研究將其特性假設為穩定且必然會發生，（二）非規律訂購訂單，本研究將其假設為訂購時機、次數以及數量皆不定等三大特性，且本研究更進ㄧ歨假設兩具有再生性質的機率分配之實例配適單位時間需求，藉此期望使模式更貼近製造商實際營運狀況，進而估計各生產週期即將會面臨之期望需求量。其次，當訂單進入生產系統，生產力確認機制將會衡量需求量，若需求量小於或等於一般生產管道之產能，則需求將利用ㄧ般自製方式進行定規時間內的製造程序，然而若需求量大於一般生產管道之產生產力確認機制將會判斷是否採用第二權變供應管道，如加班生產等策略，而本研究與過去文獻最大之不同處在於，除考慮第二個權變生產管道外，更探討各管道所須之生產率及生產批量為決策變數，並延伸經濟生產批量模式結合上述決策情境及不完美生產系統的概念，於生產規劃期間內，建構多供應管道之整合性製造系統，提供可行的多供應管道之最佳生產率及經濟生產批量模式，致使製造業者能夠面對不確定需求時，有決策制定之依據，使得整體生產系統能夠兼具成本考量以及快速回應需求，以避免缺貨情況發生。

In the past, for the traditional stable competition environment, manufacturers believed that they can continuously produce products and customers will buy any way. Manufacturers consider only their manufacture process instead of caring about the customers’ needs. However, the industry environment has changed. First of all, for customers with different procurement policies, manufacturers not only confront divinable and stable regular orders but also doubtable and unstable irregular orders. Therefore, this study considers both the regular and irregular orders to construct a model in dealing with the situation which manufacturers faced with uncertain demands. A capacity confirming mechanism is set up to examine the demand quantities. If the demand quantity is less than or equal to the capacity in the general production channel, the general supply channel is used to proceed the manufacturing procedure; if the demand quantity is greater than the capacity in the general production channel, the contingency supply channel is considered to use in addition to the general supply channel. The optimal values of production rate and production lot size for each channel are derived to provides effective information for production planning.

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