This section gives the user a top level view of the content of the activity. Subsections lay out the major pieces of work or concern in the Activity. For example, In the Planning Activity we could include estimation, schedule, training and classification as major components. 

In this example,

• each SWE link has its requirement listed below the link (Excerpt-Include)
• Each page in Supplementary Materials has its excerpt listed below the link (Excerpt-Include)

All SWEs and Topics already have excerpts. We would just need to be sure that the excerpt is suitable for the Activity as well as the other places where it is used. If we need a special description for the Activity, we could put that in a child page under the parent page and use the Include-Page macro to pull it in here.