As up-to-date competitive environment of manufacturing business has accelerated global outsourcing, the selection of the right partners becomes more important than ever in securing competitiveness. To have the best partner selections, it is necessary to discover potential partners (either suppliers or buyers) located in all over the world and to evaluate their capability to produce eventual profits. e-marketplaces of manufacturing services are collaboration systems that support cooperation between suppliers and buyers. The objective of this paper is to present a web-based collaboration system, referred to as excellent manufacturer scouting system (EMSS). EMSS provides collaboration services for discovering, evaluating, negotiating and cooperating to ensure interoperability amongst manufacturing companies. EMSS employs an ontology-based mechanism for semantic interpretation, and it is equipped with an assessment model of core manufacturability. In this paper, a supply chain collaboration model using EMSS for molding industry is also proposed.