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CHAPTER 9 / DESIGN METHODOLOGY FOR TELECOMMUNICATION SERVICES 87
FIGURE 9.2 SDL description.
number for calling, 03-5286-3830. Depending on the input by the user, the system
chooses "confirmation," "invalid," or "duplicate" and responds accordingly to the
user.
The signal sequence description or SDL description corresponds to the call-
ing process. Only professionals can describe the process in terms of signal
sequence or SDL. To further promote IT in our society, the design method needs
to be easy to manipulate not only by professionals but also by nonprofessionals.
Development of an easy-to-use design method will facilitate the smooth adoption
of IT by society. One of the advanced design methods is described next.
In this method the design process is performed as follows:
(1) Design of telecommunication service
(2) Description by state transition rule (STR)
(3) Simulation
