Abstract
The role of data abstraction in modern software engineering is examined. The benefits of software objects as instances of abstract data types (or multiprocedure modules) are explained and illustrated. The necessary language support is outlined. Some guidelines for object specification are derived from an ‘archetypal program’, partitioned into layers of virtual machines. Finally, we present a case study based on an interactice control program structure originally developed for tokamak plasma diagnostics, later adapted for astronomical database access.
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