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Frameworks are white boxes to those that make use of them. Application developers must be able to quickly understand the structure of a framework, and how to write code that will fit into the framework. Frameworks are reusable designs as well as reusable code.

— Rebecca Wirfs-Brock Object-oriented design: a responsibility-driven approach (1989)

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More quotes by Rebecca Wirfs-Brock

The goal of responsibility-driven design is to improve encapsulation. It does so by viewing a program in terms of the client/server model.

Object-oriented design: a responsibility-driven approach (1989)

A subsystem is a set of classes (and possibly other subsystems) collaborating to fulfill a set of responsibilities. Although subsystems do not exist as the software executes, they are useful conceptual entities.

Object-oriented design: a responsibility-driven approach (1989)

Responsibility-driven design is inspired by the client/server model. It focuses on the contract by asking

Object-oriented design: a responsibility-driven approach (1989)

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.

Object-oriented design: a responsibility-driven approach (1989)

Frameworks are skeletal structures of programs that must be fleshed out to build a complete application. For example, a windowing system or a simulation system can both be viewed as frameworks fleshed out by a windowed application or a simulation, respectively.

Object-oriented design: a responsibility-driven approach (1989)

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