The following are the 5 levels of a SharePoint solution and how it brings value to an organization:
Level 5 - The SharePoint solution adds exceptional value to all of the core users and customers
Level 4: The SharePoint solution is essential to the core users and customers business
Level 3: The SharePoint solution is somewhat useful to most of the core users and customers
Level 2: The SharePoint solution is useful to a limited number of targeted users and customers
Level 1: The SharePoint solution is user or customer-specific