Define the constructional breakdown of the system by decomposing it into subsystem and of the subsystem by decomposing it into components
Allocate then previously defined functions on these elements in order to trace their relationships (check that each function is performed by one and only one element and that each element is required by at least one function).
Define the constructional data model which specifies the physical structure of exchanged information between the elements. At subsystem level, the system constructional data model shall be used and eventually updated in case of need.
Define constructional interaction points between elements
Define interfaces typing the previously defined interaction points and describing the exchanged data and the dynamic behaviour of each interface.
Define the constructional internal interactions between elements by defining the constructional data exchanged between elements in order to support functional flow required by the functions performed by these elements.
Allocate constructional requirements to constructional elements.