From Joomla! Documentation
to be included in all the backround docs - and written to work for versions 1.5 and 2.5 +
There are four aspects to designing a new Joomla! web site. These also apply to planning to make alterations(including upgrading versions J1.5 to J2.5+) to an existing site or planning for transferring a site that already exists in another form into the Joomla! CMS.
- The content hierarchy:
- Who you expect to use the site and what you want them to be able to do
- The layout of the menus and the position of some functionality on the page
- The graphical design of the whole site