[[meta copyright="Copyright © 2007, 2008 Free Software Foundation, Inc."]] [[meta license="""[[toggle id="license" text="GFDL 1.2+"]][[toggleable id="license" text="Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled [[GNU_Free_Documentation_License|/fdl]]."]]"""]] Neal Walfield and Marcus Brinkmann wrote a paper titled [*A Critique of the GNU Hurd Multi-server Operating System*](http://walfield.org/papers/200707-walfield-critique-of-the-GNU-Hurd.pdf). This was published in ACM SIGOPS Operating Systems Review in July 2007. This is sometimes referred to as *the critique*. The paper provides a technical overview of the Hurd's architecture and critiques some of the decisions made.