Software Engineering

12.1.2 
Prepare structural unit specifications
Each designated structural unit must be specified to support software implemen-
tation. Structural units that are allocated multiple functional units are specified by 
combining and assimilating the set of functional unit specifications in a manner so 
as to eliminate duplication, resolve conflicting requirements, and aggregate perfor-
mance parameters. For structural units that correspond to a single functional unit, 
the structural specification inherits the requirements contained in the functional unit 
specification. In both cases, the structural unit specifications must be enhanced to 
address structural requirements, which include:
●
  Source lines of code (software size) estimates
●
  Memory utilization and resource utilization estimates
●
  Internal interface definitions (software-to-software interfaces)
●
  External interface definitions
●
  Computing environment interactions and diagnostics
●
  Real-time execution constraints
●
  Synchronous data processing execution and scheduling