Perspectives define the initial set and layout of views in the Workbench window. The RAS perspective is designed specifically for people working with reusable assets. It provides an editor area and the following views: Asset Explorer, Navigator, Outline, and Properties.
on
the shortcut bar on the right side of the Workbench window, and then click Other.
and
click OK. You may need to select the Show
all check box if you do not see the RAS (Reusable Assets) choice.