Discrimination
in ¶90-96 he provides some advice about selection and discrimination of reading sources and materials for indexing as a means of cutting down on the information overload problem
Some of his factors include: - relying on experience in a field/area to narrow down - limiting one's scope of activity - staying away from reference books (dictionaries, encyclopedias - discriminate in favor of the specific versus the general - don't admit duplicative literature (unless one is working syntopically—though he doesn't admit this caveat), and prefer the most authoritative sources - prefer authoritative authors, when given, but make space for new writers who may be more careful in their writing and argumentation - discriminate by style and composition and in particular stay away from pernicious advertising-related material (today he might advocate away from listicles, content farms, etc.)