4.4.3. SWE.3 Software Detailed Design and Unit Construction

SWE.3.BP1: Develop software detailed design. Develop a detailed design for each software component defined in the software architectural design that specifies all software units with respect to functional and nonfunctional software requirements. [Outcome 1]

SWE.3.BP2: Define interfaces of software units. Identify, specify and document the interfaces of each software unit. [Outcome 2]

SWE.3.BP3: Describe dynamic behavior. Evaluate and document the dynamic behavior of and the interaction between relevant software units. [Outcome 3]

NOTE 1: Not all software units have dynamic behavior to be described.

SWE.3.BP4: Evaluate software detailed design. Evaluate the software detailed design in terms of interoperability, interaction, criticality, technical complexity, risks and testability. [Outcome 1,2,3,4]

NOTE 2: The results of the evaluation can be used as input for software unit verification.

SWE.3.BP5: Establish bidirectional traceability. Establish bidirectional traceability between software requirements and software units. Establish bidirectional traceability between the software architectural design and the software detailed design.
Establish bidirectional traceability between the software detailed design and software units. [Outcome 4]

NOTE 3: Redundancy should be avoided by establishing a combination of these approaches that covers the project and the organizational needs.

NOTE 4: Bidirectional traceability supports coverage, consistency and impact analysis.

SWE.3.BP6: Ensure consistency. Ensure consistency between software requirements and software units.
Ensure consistency between the software architectural design, the software detailed design and software units. [Outcome 4]

NOTE 5: Consistency is supported by bidirectional traceability and can be demonstrated by review records.

SWE.3.BP7: Communicate agreed software detailed design. Communicate the agreed software detailed design and updates to the software detailed design to all relevant parties. [Outcome 5]

SWE.3.BP8: Develop software units. Develop and document the executable representations of each software unit according to the software detailed design. [Outcome 6]