Search engine design and the core information retrieval issues Relevance Performance Effective ranking -Efficient search and indexing Evaluation Incorporating new data -Testing and measuring Coverage and freshness Information needs Scalability User interaction Growing with data and users Adaptability Tuning for applications Specific problems E.g…spam 4/NSearch engine design and the core information retrieval issues Relevance -Effective ranking Evaluation -Testing and measuring Information needs -User interaction Performance -Efficient search and indexing Incorporating new data -Coverage and freshness Scalability -Growing with data and users Adaptability -Tuning for applications Specific problems -E.g., spam 4/N