Object-oriented design is the roman numerals of computing. — Object-orientation

"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."

"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."

"All OO languages show some tendency to suck programmers into the trap of excessive layering. Object frameworks and object browsers are not a substitute for good design or documentation, but they often get treated as one. Too many layers destroy transparency: It becomes too difficult to see down through them and mentally model what the code is actually doing. The Rules of Simplicity, Clarity, and Transparency get violated wholesale, and the result is code full of obscure bugs and continuing maintenance problems."

"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."

"Philosophy and cognitive science have contributed to the advancement of the object model. The idea that the world could be viewed either in terms of objects or processes was a Greek innovation, and in the seventeenth century, we find Descartes observing that humans naturally apply an object-oriented view of the world. In the twentieth century, Rand expanded upon these themes in her philosophy of objectivist epistemology. More recently, Minsky has proposed a model of human intelligence in which he considers the mind to be organized as a society of otherwise mindless agents. Minsky argues that only through the cooperative behavior of these agents do we find what we call intelligence."

"The integration technology and infrastructure elements available today, in 1993, would enable an enterprise to develop a significant integration infrastructure. However, integration projects are constrained by cultural inertia, financial and resource limitations, and, significantly, risk management Thus, projects and their supporting integration infrastructures tend to be deployed in an incremental and evolutionary manner. Since each enterprise chooses its integration path based on particular business needs, the corporations visited in this study each presented a different road map of integration efforts to date and a unique snapshot of current integration infrastructure.... DoD, in concert with leading companies, should formulate an R&D strategy to create a new generation of enterprise architectures, models, tools, and software systems, and to determine the potential for new business operations, engineering practices, and manufacturing concepts. To achieve potential functional and performance improvements, integrators should combine the leverage of several emerging threshold technologies, such as operational integration frameworks, object-based and knowledge-based product and process representations, application-oriented network services, near-term and mid-term solutions to database integration, and wide-area object brokerage and execution.-"