Editorial policy

New guides combine identified primary sources with original editorial explanations and examples. A publication date describes the guide, not the age of the original collection or the date of an unrelated project.

Evidence and examples

We distinguish verified source information, editorial interpretation and hypothetical examples. We do not describe an example as a test performed, invent a measured result or create an expert identity to support a claim. Source links are placed near the relevant statement so readers can examine its context.

Authorship

Editorial team identifies new website material. It does not attribute a new article to a historical portfolio owner, agency employee, researcher or journal editor. Original work retains its own byline and date where the source supplies them. A revision date is used for a substantive editorial update, not simply to make old material appear new.

Scope and review

These guides support careful reading and clear records. They distinguish an original project or publication from a new editorial explanation, and an observed result from a hypothetical example.

Source facts are checked for the dated edition. Details that can change should be verified with the original provider before a decision. We omit unsupported prices, availability, reviews, current operating claims and endorsements. A citation does not imply that its publisher endorses this website.