Microsoft Windows SharePoint Services and Microsoft Office SharePoint Portal
Server provide a lot of functionality out of the box. After installation you
can begin creating portal and team sites. These newly minted sites can be
customized; content can be created and managed, color themes can be modified,
and pages for the site can be edited. All of this is great, however many
attempts to create a portal within an organization fail because little or no
consideration is given to user acceptance. The most important reason for
creating a custom site definition is to address user acceptance issues.
Identifying a problem domain and designing a site definition that addresses
specific issues within that domain will greatly increase the likely success
of your portal.
Even though you could edit the files that have been distributed with
SharePoint to meet these requirements, ... (more)