definition of the processes (the activities and functions) that are required to provide the required 'User Services'; describes how the system behaves, including what it does with the inputs that it receives and how it produces the outputs

NOTE It may be described either from an object oriented, or process oriented, perspective and describes the system according to its behaviour (and may also be called the "Functional Architecture" or"Functional Viewpoint" ). In an object oriented perspective a logical architecture elaborates the conceptual behaviour and in so doing defines some detail of the objects. In a process oriented perspective, the logical (or functional) architecture determines the nature of the system (in terms of functions and data stores), and describes its conceptual behaviour and the detail of what must be done to the inputs to produce the outputs. The logical architecture is independent of any hardware or software approach.