A new specification design method for describing communication services is developed. This method describes service specifications in sequence charts and provides a user-friendly man-machine interface and specification conversion function. Applying this method to actual specification design showed that: (1) services such as call waiting or teleconference, normally impossible to represent with sequence charts, can now be described; and (2) the amount of specification description (the number of elements in sequence characters plus data required for specification conversion) for services frequently repeating the same signal elements is less than 30 percent of the number of steps in the corresponding service software. For services in which signal elements are not greatly repeated, this amount is still less than 40 percent of the number of steps if 20 percent of the signals can be shared between services.

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This paper describes a computer-aided service creation environment (CSCE) which supports easier graphical specification description for service designers having various skill levels, and service logic program (SLP) generation. CSCE is mainly composed of a stepwise service specification description1 conversion system, intelligent editors (IEDs) and an automatic specification verification system. Service specification is described by a layered service specification description language (LSDL) or SDL.IEDs provide service designers with a sophisticated manmachine interface. Three tests are conducted on the described specification and generated SLP. The effectiveness of CSCE is demonstrated by the results of SLPs created for five new practical services.

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