This book constitutes the thoroughly refereed post-conferenceproceedings of the First International Joint Conference on KnowledgeDiscovery, Knowledge Engineering, and Knowledge Management, IC3K 2009, held in Funchal, Madeira, Portugal, in October 2009.This book includes revised and extended versions of a strict selectionof the best papers presented at the conference; 27 revised full paperstogether with 3 invited lectures were carefully reviewed and selectedfrom 369 submissions. According to the three covered conferences KDIR2009, KEOD 2009, and KMIS 2009, the papers are organized in topicalsections on on knowledge discovery and information retrieval, knowledgeengineering and ontology development, and on knowledge management andinformation sharing.