Business Architecture: The Missing Link between Business Strategy and Enterprise Architecture

This white paper from SOA Consortium introduces a concept called Business Architecture. BA is defined as "the formal representation and active management of business design". To be specific, business architecture is a formalized collection of
practices, information and tools for business professionals to assess and implement business design, and
business change. Typically, the business architecture practices and artifacts in enterprise architecture frameworks focus on
business processes and business uses cases. By identifying BA as a component in EA and promoting BA (which is underdeveloped now), companies may achieve better business visibility and agility.

http://www.soa-consortium.org/EA2010_Business_Architecture.pdf