It's simple. Creating more complex applications than one page / simple blog can be problematic.
Thanks to AndrewCMS you will do the job several times faster than using other CMS systems. Forget about thousands of plugins for Joomla/Wordpress and hours spent on trial to fit them to your needs - create own modules easier than you think! No specialistic knowledge needed.
AndrewCMS provides set of basic functions that allows you to quick implement your application.