Abstract
The purpose of the “Interactive System to Help Program Design” is to help the program design in two ways:◦Defining the data structure of files which are going to be processed by a program (data driven program). As a matter of fact: it is necessary to consolidate the different files when the program processes several ones. The consolidated data structure is defined in terms of regular algebra; it is to say: using concatenation, iteration, union, intersection and complementary of data structures. Really is a formalisation and generalisation of the known Jackson method for program design.◦Defining a program as a collection of states, it is to say using an automaton to represent its functions and how going from one to other.The system has been programmed using APL, taking advantage of all the possibilities of such interactive system. It generates a root segment in structured APL (in Dijkstra sense) which can process either the data structure, detecting all kind of erroneous inputs, or the automaton used to define the program.
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