Whether you’re installing the CMS, making content, handling problems or customising, you’ll need some instructions from time to time. WordPress, Joolma! and Drupal are well-established systems and this means that you can usually find answers to problems online. WordPress has the biggest advantage here due to its popularity. The official WordPress documentation is highly comprehensive, consisting of articles and a handbook. The official forum was reasonably active.
The Joomla! website features an active forum. Documentation was plentiful, but it was difficult to navigate for a newcomer, and it varied in quality and age. The Drupal documentation was well organised, and we quickly found the traditional, full online manual. There were also many articles covering most aspects of using and administering Drupal. An active forum ticked the final box of what we expect in the case of software of this complexity.
ProcessWire isn’t as well known as the other CMSes we’ve looked at, and this means that there isn’t a huge amount of information about it on sites other than the official site itself. This site includes documentation for how to use the software, and we felt that what is there is comprehensive and complete. The official forum is well-organised with a good activity level.