Definition of the various Logical level architectural views supports the analysis of the processes, structures and other aspects, permitting optimizations to be discovered along with a better understanding of the business and the supporting information technologies. It also provides for the linkage of the Logical and Technical level structures and decisions directly back to the business drivers.

This phase has the following goals:

• Define a Logical Entity Model for the system;
• Define a Logical Process Model for the system;
• Define a Logical Locations Model for the system;
• Define a Logical Roles Model for the system;
• Update the Architecture Glossary and define Architectural Decisions as required.

A number of tasks may be undertaken in parallel, such as the definition of the various aspects, and Architectural Decisions will also arise at any time. Once a complete perspective is defined a peer review is done to decide if the IT architecture is complete, or if additional iterations are required.

These activities are best carried out by a small team staffed by cross-functional team members, lead by an IT architect. Issues that are typically architecturally significant include data, process, locations, and roles. The team should also include members with business domain experience and ideally logical level modelers and IT experts. The team should also have experience with model organization and layering. From the provided inputs, the team will need to be able to synthesize the models.