Study or Investigation Required to Ensure Accuracy
Puzzle 13 of Life of a Book Medium Pack
Question is: Study or Investigation Required to Ensure Accuracy
and the answer is: RESEARCH
Word Meaning:
RESEARCH — (uncountable, countable in some dialects) Diligent inquiry or examination to seek or revise facts, principles, theories, applications, etc. (that are currently available, or that are familiar to one's self).
Definitions from Wiktionary.