From Eclipsepedia

Higgins is organized hierarchically:

• Solutions (see Exploring Higgins) are deployable, usable apps and web services (and in a couple of cases libraries).
• Packages are mid-level multi-component packages used to create solutions
• Components are low level building blocks comprised of Eclipse projects (folders) that in turn contain files.
  • Components 1.X - used by both Higgins 1.0 and Higgins 1.1
  • Components 1.0 - used by Higgins 1.0
  • Components 1.1 - used by Higgins 1.1