Ed Yourdon quotes

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