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===WikiProjects and assessments of article importance and quality===

In 2007, the English Wikipedia introduced an assessment scale of the quality of articles.<ref name="WP 1.0 editorial team 1">{{citation |title=Wikipedia:Version 1.0 Editorial Team/Assessment|title-link=Wikipedia:Version 1.0 Editorial Team/Assessment}}</ref>{{Self-published inline|date=November 2022}} Articles are rated by WikiProjects. The range of quality classes begins with "Stub" (very short pages), followed by "Start", "C" and "B" (in increasing order of quality). Community peer review is needed for the article to enter one of the highest quality classes: either "A", "good article" or the highest, "featured article". Of the about 4.4 million articles and lists assessed as of March 2015, about 7,000 (0.16%) are a featured article or a featured list. One featured article per day, as selected by editors, appears on the main page of Wikipedia.<ref name="FMonday feat article patterns 1">{{cite journal|url=https://firstmonday.org/ojs/index.php/fm/article/view/2365/2182|title=Comparing featured article groups and revision patterns correlations in Wikipedia|journal=[[First Monday (journal)|First Monday]]|date=8 April 2009|doi=10.5210/fm.v14i5.2365|access-date=July 13, 2010|last1=Poderi|first1=Giacomo |doi-access=free }}</ref><ref name="IBM feat articles hidden pattern 1">{{cite journal|url=http://www.research.ibm.com/visual/papers/hidden_order_wikipedia.pdf|author1=Fernanda B. Viégas |author2=Martin Wattenberg |author3=Matthew M. McKeon  |name-list-style=amp |title=The Hidden Order of Wikipedia|publisher=Visual Communication Lab, IBM Research|date=July 22, 2007|access-date=October 30, 2007}}</ref> According to research in 2021, WikiProject [[Tropical cyclone|Tropical Cyclones]] has the most quality content in terms of good articles and featured articles. This is unusual, due to the project's narrow scope and member count of only around 100.<ref>{{Cite journal |last1=Jemielniak |first1=Dariusz |last2=Rychwalska |first2=Agnieszka |last3=Talaga |first3=Szymon |last4=Ziembowicz |first4=Karolina |date=September 2021 |title=Wikiproject Tropical Cyclones: The most successful crowd-sourced knowledge project with near real-time coverage of extreme weather phenomena |journal=Weather and Climate Extremes |volume=33 |page=100354 |doi=10.1016/j.wace.2021.100354 |bibcode=2021WCE....3300354J |doi-access=free }}</ref>

The articles can also be rated for importance by WikiProjects. Currently,{{when|date=September 2019}} there are 5 importance categories: "low", "mid", "high", "top", and "???" for unclassified/unsure level. For a particular article, different WikiProjects may assign different importance levels.