Clergyman's

MDA per se is relaxed about exactly what models it transforms, so long as the modeling language in which the models are expressed can be defined.
- Stephen J. Mellor

MDA per se is relaxed about exactly what models it transforms, so long as the modeling language in which the models are expressed can be defined.
- Stephen J. Mellor

What's really going on is that Executable UML is a concurrent specification language.
- Stephen J. Mellor

What's really going on is that Executable UML is a concurrent specification language.
- Stephen J. Mellor

Executable UML is designed to produce a comprehensive and comprehensible model of a solution without making decisions about the organization of the software implementation. It is a highly abstract thinking tool to aid in the formalization of knowledge, a way of thinking about and describing the concepts that make up an abstract solution to a client problem.
- Stephen J. Mellor

I assume that a precisely defined, verifiable, executable, and translatable UML is a Good Thing and leave it to others to make that case... In the summer of 1999, the UML has definitions for the semantics of its components. These definitions address the static structure of UML, but they do not define an execution semantics. They also address the meaning of each component, but there are ""semantic variation points"" which allow a component to have several different meanings. Multiple views are defined, but there is no definition of how the views fit together to form a complete model. When alternate views conflict, there is no definition of how to resolve them. There are no defined semantics for actions...
To determine what requires formalization, the UML must distinguish clearly between essential, derived, auxiliary, and deployment views. An essential view models precisely and completely some portion of the behavior of a subject matter, while a derived view shows some projection of an essential view...
All we need now is to make the market aware that all this is possible, build tools around the standards defined by the core, executable UML, and make it so...
- Stephen J. Mellor

What's the point of having metamodels, and why should you care? Because models must be stated in a way that yields a common understanding among all involved parties, we need a way to specify exactly what a model means. Metamodels allow you to do just that: They specify the concepts of the language you're using to specify a model.
- Stephen J. Mellor

What's the point of having metamodels, and why should you care? Because models must be stated in a way that yields a common understanding among all involved parties, we need a way to specify exactly what a model means. Metamodels allow you to do just that: They specify the concepts of the language you're using to specify a model.
- Stephen J. Mellor

I was astonished to be invited to what became the meeting that originated the Agile Manifesto because my work had always been based around building models... The other signatories were kind enough, back in 2001, to write the manifesto using the word “software” , not “code” As such I felt able, in good conscience, to become a signatory to the Manifesto while continuing to promote executable modeling. Ten years on we have a standard action language for agile modeling.
- Stephen J. Mellor

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 . 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.
- Stephen J. Mellor