Information retrieval 14 Information storage and retrieval systems Evaluation 4 Computer programs 2 Data processing 2 Ad hoc networks (Computer networks) 1 Attitudes 1 Behaviorism (Psychology) 1 Cost accounting 1 Cost effectiveness 1 Data mining 1 Digital libraries 1 Internet 1 Learning strategies 1 Machine learning 1 Management information systems 1 Neural networks (Computer science) 1 Online social networks 1 Recommender systems (Information filtering) 1 Social aspects 1 Social influence 1 Teachers 1 XML (Document markup language) 1