Information and Knowledge Engineering is a compendium of articles and papers that were presented at IKE '13, an international conference that serves researchers, scholars, professionals, students, and academicians.Selected topics include:* Knowledge Engineering and Management + Knowledge Acquisition* Databases, Information Retrieval and Search* Decision Support Systems* Mining of Data Rich Sources* Data and Information Mining + Forecasting Methods* Novel Methodologies and Applications* Information Retrieval, Learning Methods, and Social Networks* Data Mining, Opinion Management, Software Quality Issues, Bioinformatics, and Applications