This chapter builds on the architecture rolesmentioned in the previous chapter. Among other things, it identifies the Segment Architect. This role is responsible for (one of) the business, data, application, and technology domains, depending on the perspective from which the organization is viewed. Upon reviewing the Architecture Capability described in Chapter , it is evident that certain architecture roles are required within an organization depending on the capability’s positioning. The TOGAF Standard distinguishes three core architecture roles that relate to the Architecture Capability. There is a role for theChief/Enterprise Architectwhen the Architecture Capability is used to support strategy. The Segment Architect role is focused on supporting portfolios – and in some cases (large) projects – and theSolution Architectrole is primarily focused on providing support when the Architecture Capability is used to support solutions. Regardless of the architecture role practiced, an architect will have to deal with one or more architecture domains. This chapter explains them.