 Eighteen people compared the article they reviewed to the article on the same topic in the "Encyclopædia Britannica".Opinions on accuracy were almost equal between the two encyclopedias (6 favoring Britannica, 7 favoring Wikipedia, 5 stating they were equal), and eleven of the eighteen (61%) found Wikipedia somewhat or substantially more complete, compared to seven of the eighteen (39%) for Britannica.The survey did not attempt random selection of the participants, and it is not clear how the participants were invited.