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To us, analysis is the study of a problem domain, leading to a specification of externally observable behavior; a complete, consistent, and feasible statement of what is needed; a coverage of both functional and quantified operational characteristics (e.g. reliability, availability, performance).

— Ed Yourdon Object-oriented design (1991)

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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.

Object-oriented design (1991)

Elements (lines of code) in a coincidentally-cohesive module have no relationship. Typically occurs as the result of modularizing existing code, to separate out redundant code.

Structured design: fundamentals of a discipline of computer program and systems design (1979)

A system composed of 100,000 lines of C++ is not be sneezed at, but we don't have that much trouble developing 100,000 lines of COBOL today. The real test of OOP will come when systems of 1 to 10 million lines of code are developed.

Yourdon (1990)

Subject. A Subject is a mechanism for guiding a reader (analyst, problem domain expert, manager, client) through a large, complex model. Subjects are also helpful for organizing work packages on larger projects, based upon initial OOA investigations.

Object-oriented design (1991)

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

Object-oriented design (1991)

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Quote text and notes from Wikiquote: Ed Yourdon (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.