sentences:  Post-coordination results in a loss of precision in comparison to pre-coordination 
  
  Indexers must make decisions about what entries should be included and how many entries an index should incorporate.The depth of indexing describes the thoroughness of the indexing process with reference to exhaustivity and specificity 
  
  An exhaustive index is one which lists all possible index terms.Greater exhaustivity gives a higher recall, or more likelihood of all the relevant articles being retrieved, however, this occurs at the expense of precision.