27
either
by
interviewing
them
or
by
watching
them
work.
Besides,
we
can also review documents and policy statements. The most important
thing
is
we
can
get
all
information
available
related
to
the
current
system.
Define system requirements.
After all information
is
gathered,
it
is
very
important to
record
it. Some
of the information could be technical requirements (for example, facts
about needed system performance, expected number of transactions,
etc)
and
also
some
could
be
functional
requirements
-
what
the
system
is required to do.
There are two types
of model process: logical and physical model. A
logical model shows what the system is required to do in great detail,
without committing to any one technology. Therefore, the development
team can focus
on
what
is
needed.
A
physical
model
is
any
model
that
shows how the system will actually be implemented.
Prioritize requirements.
After all requirements are well understood and detailed models of the
requirements
are
completed,
it
is
important
to
establish
which
of
the
functional and
technical
requirements are
most crucial
for the system.
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