"Functions" are a description of WHAT the system
has to do. In the BIFA, functions are defined
at several different levels. Each inventory element is mapped to one
or more subsystems and terminators from the US and Canadian National ITS
Architectures. The general descriptions associated with these
entities identify functionality in a very general sense. At the next
level of detail, most of the ITS elements have been mapped to one or more
"Functional Areas" that provide additional functional detail. At the
most detailed level, each functional area includes several specific
Functional Requirements that precisely specify the functions to be
performed. All three levels of detail are available on this web
site. The subsystems and functional areas that are associated with
the BIFA are listed in the table below. Each Functional Area is a link to more
detailed information, including the portion of the BIFA that implements
(or will implement) the function, and the Functional Requirements that may be applicable.
This same information can be accessed from the Inventory by selecting an
element and then selecting the "Functions" to see functional information
for a specific inventory element.
