b+b has been examined and certified by the independent institute for "Learner-Oriented Quality Testing in Further Education and Training" (Lernerorientierte Qualitätstestierung in der Weiterbildung). ver.di b+b also works as a book publishing house and publishes guidebooks, work guides and legal commentaries. The company's head office is based in the German city of Düsseldorf. ver.di b+b is represented in 25 locations throughout Germany. Its subsidiary "Rat.geber GmbH" advises boards and committees and runs the public bookshop at Verdi's administrative headquarters in Berlin. International memberships Verdi is a member of multiple global union federations such as the UNI Global Union, the International Transport Workers' Federation, the International Graphical Federation, the International Federation of Journalists and the Public Services International. It is also a member of the European Movement Germany (EBD) and a partner of the Tax Justice Network. Publications Verdi publishes a multitude of different magazines for its members. All members receive the magazine "Verdi Publik" for free eight times a year. Other Verdi publications include the media policy magazine "M – Menschen Machen Medien" (M – People Make Media), which, like the publications "Druck + Papier" (Printing + Paper) and "Kunst + Kultur" (Art + Culture), is published by the National Executive Board and the Media, Art and Industry division. Criticism Ever since Verdi was first founded, its complex organisational structure has repeatedly been the subject of criticism: In as early as 2001, for example, the German daily newspaper Der Tagesspiegel warned readers about the threat of "losses and inefficiency due to friction". The Sunday newspaper Welt am Sonntag also reported on "frictions and budget disputes" within the trade union. The daily newspaper Die Tageszeitung claimed that Verdi's matrix model was "so complicated" that even full-time Verdi employees "had a hard time" explaining it. The weekly news magazine Stern also reported on Verdi, stating that its divisions, state associations and districts "worked against each other more than with one another". On top of these media reports, Verdi's organisation structure also received criticism from within its own ranks time and time again, so much so that a response to this criticism was factored into the "Perspektive 2015" initiative. Critics also accused Verdi of taking a strong stand in favour of employee rights and fair wages in public but not aiming to achieve these goals on an internal level. One example was the canteen at Verdi's headquarters in Berlin, which was operated by