Text: The combination of methodologies in the study of the same phenomenon or construct; a method of establishing the accuracy of information by comparing three or more types of independent points of view on data sources (for example, interviews, observation, and documentation; different investigations; different times) bearing on the same findings.
Entailment: There is a method of establishing the accuracy of information by which one compares multiple types of independent viewpoints on sources of data and reaching the same conclusion.
Contradiction: It does no good to compare more than three types of independent viewpoints on data sources.