This book constitutes the post-proceedings of the International Workshop on Ontology, Conceptualization and Epistemology for Information Systems, Software Engineering and Service Sciences (ONTOSE 2010), held at the CAiSE 2010 conference in Hammamet, Tunisia, June, 2010.

The 10 papers presented in this volume were carefully revised and selected from 25 submissions. They are grouped in sections on enterprise and service architectures, ontology applications, ontology visualization and query expansion, and ontologies for services.

This volume constitutes the proceedings of the 4th International United Information Systems Conference, UNISCON 2012, which was held in Yalta, Ukraine, during June 1-3, 2012. UNISCON 2012 was affiliated with the 8th International Conference on ICT in Education, Research, and Industrial Applications, ICTERI 2012. The 14 full papers, four short papers, and three extended abstracts presented with a keynote speech were carefully reviewed and selected from 96 submissions. The topical sections covered are: data management; applications; modeling and semantics; and social issues in information...