Software Engineering

Table 4.1 
Software Development Project Organizational Work Load
Organization
No. of Work Products
% of Work Plan
Project management
20
22%
Software engineering
21
23%
Software implementation
10
11%
Software test and evaluation
 
9
10%
Computing environment definition
 
9
10%
Post-development software sustainment
22
24%
Total
91

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4.2 
Software architecture
4.2 
Software architecture
The software architecture identifies the operational and business needs and char-
acteristics associated with the software product. Software engineering establishes 
a software architecture to address the functional and physical configuration of the 
software product and influences the post-development processes. Thus, the soft-
ware architecture involves the software product architecture and the architectures 
for each of the post-development processes. 
Figure 4.4
 shows the software archi-
tecture and its relationships to the software product and post-development process 
architectures.
Each architecture involves three distinct but integrated perspectives: require-
ments baseline, functional architecture, and physical architecture. The 
requirements 
baseline
 represents the set of requirement specifications that address the software 
product or post-development process area. The 
functional architecture
 represents 
the functional and performance decomposition of the requirements into functional 
components and units. One or more behavioral models can be developed to depict 
the functional flows, data flows, timing, and execution logic in terms of loops and 
business rules (e.g., 
If … Then … Else …, Select … Case
 constructs). 
Each functional element is characterized by a specification that provides the details 
concerning its performance, behaviors, and handling of error conditions. The 
phys-
ical architecture
 represents the structural design of the software product or post-
development process area. It is derived from the lowest-level functional units and 
addresses the component integration strategy that guides the assembly, integration, 
and testing of the software product or post-development process area.
FIGURE 4.3
Recommended software development IPTs.

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