„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, p. 141
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„[Object-oriented analysis is] the challenge of understanding the problem domain and then the system's responsibilities in that light.“

—  Ed Yourdon American software engineer and pioneer in the software engineering methodology 1944 - 2016
p. 8-9; as cited in: Elisa Bertino, ‎Susan Urban (1994) Object-Oriented Methodologies and Systems. p. 160.

Grady Booch photo

„Perhaps the greatest strength of an object-oriented approach to development is that it offers a mechanism that captures a model of the real world.“

—  Grady Booch American software engineer 1955
Grady Booch (1986) Software Engineering with Ada p. 220. cited in: David J. Gilmore et al. (1994) User-Centred Requirements for Software Engineering Environments. p. 108

Grady Booch photo
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„OOA - Object-Oriented Analysis - is based upon concepts that we first learned in kindergarten: objects and attributes, wholes and parts, classes and members.“

—  Ed Yourdon American software engineer and pioneer in the software engineering methodology 1944 - 2016
p. 1; cited in: Sten Carlsson and Benneth Christiansson. (1999) " The Concept of Object and its Relation to Human Thinking: Some Misunderstandings Concerning the Connection between Object-Orientation and Human Thinking http://www.vits.org/publikationer/dokument/289.pdf." Informatica, Lith. Acad. Sci. 10.2. p. 147-160.

„OOA - Object-Oriented Analysis - is based upon concepts that we first learned in kindergarten: objects and attributes, wholes and parts, classes and members.“

—  Peter Coad American software entrepreneur 1953
Peter Coad & Ed Yourdon (1991, p. 1); cited in: Sten Carlsson and Benneth Christiansson. (1999) " The Concept of Object and its Relation to Human Thinking: Some Misunderstandings Concerning the Connection between Object-Orientation and Human Thinking http://www.vits.org/publikationer/dokument/289.pdf." Informatica, Lith. Acad. Sci. 10.2. p. 147-160.

Grady Booch photo

„In a quality object-oriented software system, you will find many classes that speak the language of the domain expert“

—  Grady Booch American software engineer 1955
p. 39; as cited in: Journal of Database Management. Vol 10-11. p. 33

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„Object-oriented design is the roman numerals of computing.“

—  Rob Pike software engineer 1956
Rob Pike (2004) comment in comp.os.plan9 http://groups.google.com/group/comp.os.plan9/msg/006fec195aeeff15 group at groups.google.com, 02-03-04

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