Introduction-Conceptual model Documents Query Indexing Formulation Keywords Document representation Query representation Inverted index (Algorithm Design) Retrieval function Relevance Retrieval results feedback Matching content+ structure Presentation of related components (Scoring and Ranking (Semantic Definition)5 Introduction-Conceptual Model Keywords Inverted index (Algorithm Design) Matching content + structure (Scoring and Ranking) Presentation of related components (Semantic Definition) Documents Query Document representation Retrieval results Query representation Indexing Formulation Retrieval function Relevance feedback