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Chapter 2. Definitions, design points, and key concepts 33
Operation analysis also involves a black box to white box transformation—first we
specify the system operations (derived from the white-box
enterprise analysis) in
a system black-box view, then we realize those operations in system white-box
diagrams consisting of collaborating subsystems.
The aforementioned alternation noted occurs in both the model levels and the
system decomposition levels:
In model levels, specification at one level is realized in the next. Note,
however, that the realization becomes the specification for the next lower
level. So, specification at the context level is realized in the analysis level. This
is turn is the specification for the design level.
In system decomposition level, specifications at the enterprise level [or level
N] are realized in the system level [or level N + 1]. This set of realizations
becomes the specifications for the subsystem level.
We discuss these transformations in detail in the following chapters.