Text: In backfilling, the evaluator might call the author, visit the author to review the original data, or contact others who were knowledgeable about the design decisions in order to get adequate information on instance selection.
Entailment: The evaluator may contact the author or others who are knowledgeable in the area i order to get adequate information.
Contradiction: It is not true that an evaluator may visit the author to review the original data.