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Open-source content management systems (CMS) are a large family of Web applications, but if we're looking for stability, performance and average technical requirements, we'll come up with a handful of options. In the past, choosing the "right" CMS was a matter of the project's requirements, but now this is not completely valid because the paradigm of extensibility had driven the development of major CMS' towards a model of core features that are extensible with plug-ins that fill virtually any requirement.
Picking the right CMS is then a matter of "mental models": choosing the one that best fits our vision of how a Web application should work and what it should provide to users and administrators. In this article, we'll explore the main difference in the mental models: of WordPress and Joomla for theming and extending their core.