Ivar Jacobson quote: “The analysis model will not be a reflection of what the problem domain looks like… The reason is simply to get a more m…”

“In object-oriented analysis, we seek to model the world by identifying the classes and objects that form the vocabulary of the problem domain, and in object-oriented design, we invent the abstractions and mechanisms that provide the behavior that this model requires.”

Grady Booch (1955) American software engineer

Source: Object-oriented design: With Applications, (1991), p. 141

“We build models to increase productivity, under the justified assumption that it's cheaper to manipulate the model than the real thing. Models then enable cheaper exploration and reasoning about some universe of discourse. One important application of models is to understand a real, abstract, or hypothetical problem domain that a computer system will reflect. This is done by abstraction, classification, and generalization of subject-matter entities into an appropriate set of classes and their behavior.”

Stephen J. Mellor (1952) British computer scientist

Source: MDA Distilled. Principles of Model-Driven Architecture, 2003, p. 35-36.

“The problem is that there is no alternative to models. We all think in simplified models, all the time. The sophisticated thing to do is not to pretend to stop, but to be self-conscious — to be aware that your models are maps rather than reality.”

Paul Krugman (1953) American economist

Source: Development, Geography, and Economic Theory (1995), Ch. 3. Models and Metaphors

“This paper reviews prior applications of ) between 1977 and 1994. After documenting and characterizing the number of applications over time, we discuss important methodological issues related to structural equation modeling and assess the quality of previous applications in terms of three aspects: issues related to the initial specification of theoretical models of interest; issues related to data screening prior to model estimation and testing; and issues related to the estimation and testing of theoretical models on empirical data. On the basis of our findings, we identify problem areas and suggest avenues for improvement.”

Christian Homburg (1962) German academic

Article abstract
"Applications of structural equation modeling in marketing and consumer research", 1996

“While a small domain (consisting of fifty or fewer objects) can generally be analyzed as a unit, large domains must be partitioned to make the analysis a manageable task. To make such a partitioning, we take advantage of the fact that objects on an information model tend to fall into clusters: groups of objects that are interconnected with one another by many relationships. By contrast, relatively few relationships connect objects in different clusters.
When partitioning a domain, we divide the information model so that the clusters remain intact… Each section of the information model then becomes a separate subsystem. Note that when the information model is partitioned into subsystems, each object is assigned to exactly one subsystem.”

Stephen J. Mellor (1952) British computer scientist

Source: Object-Oriented Systems Analysis: Modeling the World In Data (1988), p. 145; as cited in: The Object Agency, Inc. (1995) " A Comparison of Object-Oriented Development Methodologies http://www.ipipan.gda.pl/~marek/objects/TOA/OOMethod/mcr.html".

“While a small domain (consisting of fifty or fewer objects) can generally be analyzed as a unit, large domains must be partitioned to make the analysis a manageable task. To make such a partitioning, we take advantage of the fact that objects on an information model tend to fall into clusters: groups of objects that are interconnected with one another by many relationships. By contrast, relatively few relationships connect objects in different clusters.
When partitioning a domain, we divide the information model so that the clusters remain intact… Each section of the information model then becomes a separate subsystem. Note that when the information model is partitioned into subsystems, each object is assigned to exactly one subsystem.”

Sally Shlaer (1938–1998) American computer scientist

Source: Object-Oriented Systems Analysis: Modeling the World In Data (1988), p. 145; as cited in: The Object Agency, Inc. (1995) " A Comparison of Object-Oriented Development Methodologies http://www.ipipan.gda.pl/~marek/objects/TOA/OOMethod/mcr.html"

“Models, even male models — how small they've gotten! It looks great for the clothes, but it's not what you want in real life. Why do we have to keep looking at ourselves and measuring?”

Demi Moore (1962) American actress

Demi Moore Cover Interview - Demi Moore on Fame and Family - Harper's BAZAAR August 3, 2010 http://www.harpersbazaar.com/magazine/cover/demi-moore-cover-interview-0410

“Obviously, the faster we process information, the more rich and complex our models or glosses — our reality-tunnels — will become.”

Robert Anton Wilson book Quantum Psychology

Quantum Psychology : How Brain Software Programs You and Your World (1990), p. 45
Context: Obviously, the faster we process information, the more rich and complex our models or glosses — our reality-tunnels — will become.
Resistance to new information, however, has a strong neurological foundation in all animals, as indicated by studies of imprinting and conditioning. Most animals, including most domesticated primates (humans) show a truly staggering ability to "ignore" certain kinds of information — that which does not "fit" their imprinted/conditioned reality-tunnel. We generally call this "conservatism" or "stupidity", but it appears in all parts of the political spectrum, and in learned societies as well as in the Ku Klux Klan.

“Models of management sometimes come from task and function analyses of management jobs. Someone studies what managers do, or what duties and responsibilities they are expected to perform, and then develops a model or image of what competent management is (Mintzberg, 1973). Typically, task and function analyses result in detailed descriptions of what activities must be performed in the job. Often these are not arrayed in any order of importance or relevance to the particular job or to the desired output from someone performing the job. Such models have been tested, in that systematic research is conducted to determine if the dentified activities are part of the job. Unfortunately, models based on task or function analysis focus on the job and do not address the person in the job. In doing so, the models include many specific and detailed descriptions of activities, but no mention is made of the characteristics that enable or increase the likelihood of a person performing those activities. These models do not establish a casual link between characteristics of people and performance in a job.”

Richard Boyatzis (1946) American business theorist

Source: Competent manager (1982), p. 7-8.

“If we are to use effectively these abstract models and this descriptive material, we must have a comparable exploration of the criteria for determining what abstract model it is best to use for particular kinds of problems, what entities in the abstract model are to be identified with what observable entities, and what features of the problem or of the circumstances have the greatest effect on the accuracy of the predictions yielded by a particular model or theory.”

Milton Friedman (1912–2006) American economist, statistician, and writer

"The Methodology of Positive Economics" (1953)

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