 The test was commissioned to a research institute (Cologne-based "WIND GmbH"), whose analysts assessed 50 articles from each encyclopedia (covering politics, business, sports, science, culture, entertainment, geography, medicine, history and religion) on four criteria (accuracy, completeness, timeliness and clarity), and judged Wikipedia articles to be more accurate on the average (1.6 on a scale from 1 to 6 versus 2.3 for Brockhaus, with 1 as the best and 6 as the worst).Wikipedia's coverage was also found to be more complete and up to date; however, Brockhaus was judged to be more clearly written, while several Wikipedia articles were criticized as being too complicated for non-experts, and many as too lengthy.In its April 2008 issue British computing magazine "PC Plus" compared the English Wikipedia with the DVD editions of "World Book Encyclopedia" and "Encyclopædia Britannica", assessing for each the coverage of a series of random subjects.