委外製造模式讓無工廠的製造商(Fabless manufacturers; FMs)可以集中資源在自己的核心業務，而在供應鏈仍可保有有競爭力。然而，整個生產活動皆由CM所承包，FMs很難管控委外生產風險，因此FM為了維持客戶的達交率通常須以較高的庫存水位來對應，但因此卻造成高庫存成本。本研究提出一個雲製造服務稱作虛擬生產管制服務（VPCS），目的協助FMs立即找出 CMs的潛在生產風險及相對應的解決方法以改善需求達交率。藉由萃取代工廠最新的在製品資訊，VPCS依據最佳生產模型即時推估出生產進度與潛在的生產風險。而且生產風險經過嶄新的風險控管程序處理後將得以減緩風險甚至解決，最後庫存水位可以降低下需求仍可以穩定達交。最後將以一家實際FM案例研究，以證明VPCS相對於傳統委外生產管理模式是可以大幅改善達交率與庫存水準。

Outsourcing production enables fabless companies to focus on their main business and yet still stay competitive in the supply chain. However, as the actual production progress of a Contract Manufacturer (CM) is encapsulated, the Fabless Manufacturer (FM) frequently struggles with higher inventory levels than its actual demands in response to outsourcing production risks. This study proposes Virtual Production Control Services (VPCS) for a company to identify the production risks of its CM and come up with corresponding solutions for improving demand fulfillment. By mining the updated work-in-process data from the CM, the VPCS can identify the potential production risks in a timely manner by estimating production progress based on an optimal planning model. In addition, production risks can be mitigated after applying a novel risk-control scheme such that demands can be fulfilled with reduced inventory levels. A FM case study indicates that VPCS is a promising method to improve the outsourcing efficiency of a company in the IC supply chain.

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