【正文】 ? High recall ? High precision ? Moderate levels of recall and precision 3. Select database(s) and search system 4. Identify major concepts or facets and their logical relationships with one another 6 Building Blocks Search Strategy2/4 5. Identify ? search strings that represent the concepts ? Words ? Fulltext phrases ? Pieces of words ? Descriptors ? Identifiers ? Codes ? Nonsemantic bibliographic characteristics ? 非主題相關(guān)的欄位，如資料類型、語言、年代等 ? 包括同義詞、類同義詞、狹義詞、相關(guān)詞 ? fields to be searched 7 Building Blocks Search Strategy3/4 6. For each distinct facet of the search, a set of postings will be created for each search string within that facet. The sets are then bined into a single set representing that facet using Boolean OR 7. Following setp6, the facets sets themselves will be bined with Boolean AND and NOT 8. Plan alternatives 8 Building Blocks Search Strategy4/4 9. Formulate the initial statements of the search in the mand language of the system 10. Logon and put the search to the system 11. Evaluate the intermediate results 12. Iterate ? Use the interactive features of the system to carry out search heuristics ? tactics, maneuvers, strategies, tricks, devices, approaches, to try to improve search results 9 Building blocks approach Facet A Facet B Term A1 OR Term A2 OR …… ….. Term Ap Term B1 OR Term B2 OR …… ….. Term Bq Fact C Term C1 OR Term C2 OR …… ….. Term Cr Answer Set Boolean bination of facets (AND, OR, NOT) 10 Building Blocks search sample Facet 1 Facet 2 Facet 3 Facet 4 Facet 5 RISK MEASUREMENT RISK AVERSION BEHAVIORAL DECISION THEORY INSURANCE risk measurement assessment choice decision oute risk aversion risk avoidance risk neutrality risk prone risk tendency behavioral decision theory insurance contract bank finance stock investment advertisement Measurement of Risk Tendencies（ ? looking for high recall） Boolean Combination: ((RISK AND MEASUREMENT) OR RISK AVERSION OR BEHAVIORAL DECISION THEORY) NOT INSURANCE 11 檢討結(jié)果重新檢索 ? 想增加 recall時 ? find additional concepts or search terms to a