Actor Prolog is well adapted for implementation of different methods of visual programming. ... To create a source SADT diagram it is possible to use any diagram tools with IDL format support (like BPwin (TM) PLATINUM technology, Inc. or Design/IDEF (TM) Meta Software Corporation). ... Consequently, Actor Prolog has to create two processes and guarantee the capability of message transmitting between them. ... class 'Receiver': -- entry_i1; value_i1; -- con; -- [ goal:-!. -- show ( _ ) :-!, con ? ...