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Delta system description language
Kristen Nygaard and two other scientists - Petter Haandlykken and Erik Holbæk-Hanssen - decided to develop a successor for Simula, but with main focus of system description - not execution. This lead to a language called Delta. Since SIMULA was designed as compilable and executable programming language, it was not possible to describe continuous changes of state as well as interrupts and states determined by mathematical and other relations. The DELTA system description language addressed these tasks. Today the language seems to be a useful platform for description of many aspects of the interactions between human actors and computing equipment. In Delta you could express true concurrent objects and use predicates to express state changes. Delta could, however, not be executed. So what happened to Delta? There is a (big) report describing Delta and there has later been some related work on Delta including using it in a few projects, but it is no longer being used or developed. The language Epsilon was a simplified version of Delta and the result of attempts to formalize Delta by means of Petri Nets. Comment by Kristen Nygaard: The DELTA language will in my opinion get much more interest in the years to come, since it will become necessary to give more concise descriptions (and prescriptions) of the actions spaces of human actors in information systems. [Source:http://heim.ifi.uio.no/~kristen/]
 

 

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