A method is disclosed for quantitatively assessing information in natural language contents related to an object name. The method includes identifying a sentence in a document, determining a subject and a predicate in the sentence, and retrieving an object-specific data set related to the object name. The object-specific data set includes property names and association-strength values. Each property name is associated with an association-strength value. The method also includes identifying a first property name in the property names that matches the subject, assigning a first association-strength value associated with the first property name to the subject, identifying a second property name in the property names that matches the predicate, assigning a second association-strength value associated with the second property name to the predicate, and multiplying the first association-strength value and the second association-strength value to produce a sentence information index.