„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, p. 36.
Stephen J. Mellor13
British computer scientist 1952

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„I know that I disagree with many other UML experts, but there is no magic about UML. If you can generate code from a model, then it is programming language. And UML is not a well-designed programming language.
The most important reason is that it lacks a well-defined point of view, partly by intent and partly because of the tyranny of the OMG standardization process that tries to provide everything to everybody. It doesn't have a well-defined underlying set of assumptions about memory, storage, concurrency, or almost anything else. How can you program in such a language?
The fact is that UML and other modelling language are not meant to be executable. The point of models is that they are imprecise and ambiguous. This drove many theoreticians crazy so they tried to make UML "precise", but models are imprecise for a reason: we leave out things that have a small effect so we can concentrate on the things that have big or global effects. That's how it works in physics models: you model the big effect (such as the gravitation from the sun) and then you treat the smaller effects as perturbation to the basic model (such as the effects of the planets on each other). If you tried to solve the entire set of equations directly in full detail, you couldn't do anything.“

—  James Rumbaugh Computer scientist, software engineer 1947
James Rumbaugh in Federico Biancuzzi and Shane Warden eds. (2009) Masterminds of Programming. p. 339; cited in " Quote by James Rumbaugh http://www.ptidej.net/course/cse3009/winter13/resources/james" on ptidej.net. Last updated 2013-04-09 by guehene; Rumbaugh is responding to the question: "What do you think of using UML to generate implementation code?"

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„Scientific language, which Korzybski used as his model of sane language, is almost exclusively extensional and denotative, or at least tries to be.“

—  Neil Postman American writer and academic 1931 - 2003
Context: Scientific language, which Korzybski used as his model of sane language, is almost exclusively extensional and denotative, or at least tries to be. The language of the mentally ill, most obviously "un-sane," is almost totally intensional and connotative. This is the language that does not correspond to anything "out there," and this is, in fact, how and perhaps even why the user is mentally ill. Korzybski's concern with keeping the conscious "connection" or correspondence between language and verifiable referents is, for all practical purposes, paralleled by the process of psychotherapy. In this process, which is largely "just talk," the purpose is to foster closer and more accurate correspondence between the patient's language and externally verifiable meanings. As a semanticist would say, the process of psychotherapy is aimed at shifting the patient's word choices from those having a highly intensional, connotative meanings to others carrying more denotative meanings. A person suffering from paranoid schizophrenia might use perfectly "correct" English in an unassailably "logical" way, but the problem with his language is that it does not correspond to anything "out there."

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„Your problem is your role models were models.“

—  Lily Tomlin American actress, comedian, writer, and producer 1939

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„All models are wrong; some models are useful.“

—  George E. P. Box British statistician 1919 - 2013
For instance in George E. P. Box, William Hunter and Stuart Hunter, Statistics for Experimenters, second edition, 2005, page 440. See "All models are wrong".

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