“Object-oriented programming languages support encapsulation, thereby improving the ability of software to be reused, refined, tested, maintained, and extended. The full benefit of this support can only be realized if encapsulation is maximized during the design process.
We argue that design practices which take a data-driven approach fail to maximize encapsulation because they focus too quickly on the implementation of objects. We propose an alternative object-oriented design method which takes a responsibility-driven approach. We show how such an approach can increase the encapsulation by deferring implementation issues until a later stage.”

—  Rebecca Wirfs-Brock

Source: Object-oriented design: a responsibility-driven approach (1989), p. 71: Abstract

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Rebecca Wirfs-Brock13
American software engineer 1953

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“Encapsulation is the key to increasing the value of such software metrics as reusability, refinability, testability, maintainability, and extensibility. Object-oriented languages provide a number of mechanisms for improving encapsulation, but it is during the design phase that the greatest leverage can be realized.
The data-driven approach to object-oriented design focuses on the structure of the data in a system. This results in the incorporation of structural information in the definitions of classes. Doing so violates encapsulation.
The responsibility-driven approach emphasizes the encapsulation of both the structure and behavior of objects. By focusing on the contractual responsibilities of a class, the designer is able to postpone implementation considerations until the implementation phase.
While responsibility-driven design is not the only technique addressing this problem, most other techniques attempt to enforce encapsulation during the implementation phase. This is too late in the software life-cycle to achieve maximum benefits.”

Rebecca Wirfs-Brock (1953) American software engineer

Source: Object-oriented design: a responsibility-driven approach (1989), p. 75: Conclusion

“Object-oriented programming increases the value of these metrics by managing this complexity. The most effective tool available for dealing with complexity is abstraction. Many types of abstraction can be used, but encapsulation is the main form of abstraction by which complexity is managed in object-oriented programming.
Programming in an object-oriented language, however, does not ensure that the complexity of an application will be well encapsulated. Applying good programming techniques can improve encapsulation, but the full benefit of object-oriented programming can be realized only if encapsulation is a recognized goal of the design process.”

Rebecca Wirfs-Brock (1953) American software engineer

Source: Object-oriented design: a responsibility-driven approach (1989), p. 71

Grady Booch photo

“Object-oriented design is a method of design encompassing the process of object-oriented decomposition and a notation for depicting both logical and physical as well as static and dynamic models of the system under design.”

Grady Booch (1955) American software engineer

Source: Object-oriented design: With Applications, (1991), p. 37

Grady Booch photo

“Structured design does not scale up well for extremely complex systems, and this method is largely inappropriate for use with object-based and object-oriented programming languages.”

Grady Booch (1955) American software engineer

Source: Object-oriented design: With Applications, (1991), p. 19

Ed Yourdon photo

“Designed as a companion volume to the acclaimed Object-Oriented Analysis, this book focuses on the middle part of the software lifecycle: the activity of design. It shows readers how to apply object-oriented design, and how to tailor and expand the method to suit specific organization and project needs. Readers will explore the major issues in OOD; the role of OOD in the systems lifecycle; how to use graphical notation; strategies for creating design; and hints for evaluating the efficiency of a design created with OOD. For software engineers and other users undertaking real-world systems development projects and designing overall software architecture for systems will find this reference approach to improving systems design indispensable.”

Ed Yourdon (1944–2016) American software engineer and pioneer in the software engineering methodology

Abstract.
Object-oriented design (1991)

“In order to better understand object-oriented methodologies in general, it helps to understand the people who make up the "object-oriented community" itself. Far from being monolithic, there is a great deal of diversity within this community. Many object-oriented people, for example, seem to focus almost entirely on programming language issues. They tend to cast all discussions in terms of the syntax and semantics of their chosen object-oriented programming language. These people find it impossible (for all intents and purposes) to discuss any software engineering activity (e. g., analysis, design, and testing) without direct mention of some specific implementation language.
Outside of producing executable "prototypes", people who emphasize programming languages seldom have well-defined techniques for analyzing their clients' problems or describing the overall architecture of the software product. A great deal of what they do is intuitive. If they happen to have a natural instinct/intuition for good analysis or good design, their efforts on small-to-medium, non-critical projects can result in respectable software solutions.”

Edward V. Berard

Source: Essays on object-oriented software engineering (1993), p. 5

Rob Pike photo

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

Rob Pike (1956) software engineer

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

Grady Booch photo

“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

“Responsibility-driven design specifies object behavior before object structure and other implementation considerations are determined. We have found that it minimizes the rework required for major design changes.”

Rebecca Wirfs-Brock (1953) American software engineer

Source: Object-oriented design: a responsibility-driven approach (1989), p. 74

“If there is ever a science of programming language design, it will probably consist largely of matching languages to the design methods they support.”

Robert Floyd (1936–2001) American computer scientist

The Paradigms of Programming (1979)

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