“The inability to isolate software components from each other is the main reason why many popular programming languages cannot be used for making robust system software.”

—  Joe Armstrong

page 32
Making Reliable Distributed Systems in the Presence of Software Errors

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Joe Armstrong36
British computer scientist 1950–2019

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“Creating a modeling language that is also an executable language has long been a goal of the software community. Many years ago, in 1968 to be exact, while working with software components to successfully develop a telecommunications system, we created a modeling language that was the forerunner to UML. To model components we used sequence diagrams, collaboration diagrams, and state transition diagrams (a combination of state charts and activity diagrams). Our modeling language then seamlessly translated the component models into code. Each code component was in its turn compiled into an executable component that was deployed in our computer system. The computer system was a component management system—thus we had "components all the way down."”

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“While the creative works from the 16th century can still be accessed and used by others, the data in some software programs from the 1990s is already inaccessible.”

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Context: While the creative works from the 16th century can still be accessed and used by others, the data in some software programs from the 1990s is already inaccessible. Once a company that produces a certain product goes out of business, it has no simple way to uncover how its product encoded data. The code is thus lost, and the software is inaccessible. Knowledge has been destroyed.

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“Executable UML is at the next higher layer of abstraction, abstracting away both specific programming languages and decisions about the organization of the software so that a specification built in Executable UML can be deployed in various software environments without change.”

Stephen J. Mellor (1952) British computer scientist

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