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A programming support system using extended Nassi-Shneiderman diagrams (NSD) is described. The aim of the work is to develop techniques for improving the quality and cost of specifying, documenting and producing computer programs. NSD's can be executed interpretively or compiled to produce running code. The system implementation has begun and charts can be drawn on a variety of display devices. The system is being developed using the Picture Building System developed earlier.

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This paper describes a general purpose 'picture building system'.The main purpose of the system is to provide an environment wherein an application programmer can interactively create and modify applications. In addition to a graphics software package the picture building system provides high-level application building tools and a relational data base as integral parts of the system. An interpreter is provided to draw pictures from data stored in relations. A correlation handler is provided to allow a user to identify and manipulate displayed items.A relations editor is provided to interactively create, edit, and display relations. The picture building system works on a variety of graphic and nongraphic terminals. CR Categories 4.3, 4.4, 8.2

Pointing at items on a graphics display is one of the most useful methods of interacting with a system graphically. This paper examines existing graphical support and lists requirements for high-level support of graphical interaction. The architecture of a prototype system with high-level support for graphical interaction is presented. This includes database support for manipulating graphical data and device-independent graphical support based on a proposed standard for graphical interaction. Algorithms are presented for identifying items selected from a display by the user. Inclusion of a database management system in graphical software support is shown to be helpful in meeting the requirements of interactive graphical application programs.

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