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Department of Computer Science, Fredrik Bajers Vej 7E, 9220 Aalborg Ø, Denmark. Internet: normark@iesd.auc.dk. - This research was supported in part by the Danish Natural Science Research Council, grant no. 9400911.

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This understanding of the word model is adapted from Webster's dictionary.

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From figure 1 it may be noticed that the abstraction of the process program aspects may be reached both from the program and from the program execution. The reason is that a program (considered as the source) contains both structural aspects and process aspects. Consequently, it is possible to focus on the process aspects from an abstraction applied on the (source) program as well as via an abstraction applied on the program execution.

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This definition is taken from the American Heritage Dictionary of the English Language

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This is an idea which borrows from the algebraic theory of abstract data types, in which ``an object'' is represented in terms of the constructor history.

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It is generally accepted that implicit object deletion via use of some automatic memory management scheme (such as garbage collection) is of great value at the programming level. But this does not necessarily imply that object deletion is entirely irrelevant to the designer.