Working with Navigation Flows - Oracle ADF 11gR2 Development Beginner's Guide - page 192

Backing Bean Scope : The scope is just like Request Scope and is only used for
a managed bean and for developing custom components. Each page can have
more than one page fragment or a declaraive component and we would
want to separate the scope instances from each other. The scope is used as
#{backingBeanScope.param} .
View Scope : The object is available only for the ime the view ID is available
and it is unavailable if the ID changes. If we want to store informaion that
needs to be available only for a single page, we will use the View Scope .
It is used as #{viewScope.param} .
Relationships between the scopes
The following diagram will explain the relaionship between the various scopes that are
available in ADF:
The previous image explains the scopes using the .jspx page in an unbounded task flow.
The View acivity, Method call acivity, and Task Flow Call acivity are included in the low.
Applicaion Scope is available throughout the applicaion.
Session Scope ends at the last View acivity.