Object Design: Roles, Responsibilities, and Collaborations
Product Author Bios
Rebecca Wirfs-Brock is founder of Wirfs-Brock Associates. She consults with clients on actual architecture and design projects as well as development practices and methods. She is the originator of the set of development practices known as Responsibility-Driven Design. Among her widely used inventions are use case conversations and object role stereotypes. She was lead author of the classic work Designing Object-Oriented Software (Prentice-Hall, 1990).
Alan McKean is a respected object technology educator and cofounder of Wirfs-Brock Associates. His classes have introduced thousands of developers to object-oriented design and programming and his instructional techniques have been widely adopted by other educators. An experienced programmer, speaker, and instructor, Alan has developed curricula in object-oriented design, programming, and distributed object systems.
If you create software using object-oriented languages and tools, then Responsibility-Driven Design has likely influenced your work. For over ten years Responsibility-Driven Design methodology has been the standard bearer of the behavioral approach to designing object-oriented software. Object Design: Roles, Responsibilities, and Collaborations focuses on the practice of designing objects as integral members of a community where each object has specific roles and responsibilities. The authors present the latest practices and techniques of Responsibility-Driven Design and show how you can apply them as you develop modern object-based applications.
Working within this conceptual framework, Rebecca Wirfs-Brock and Alan McKean present how user requirements, system architecture, and design patterns all contribute to the design of an effective object model. They introduce a rich vocabulary that designers can use to discuss aspects of their designs, discuss design trade-offs, and offer practical guidelines for enhancing the reliability and flexibility of applications. In addition, case studies and real-world examples demonstrate how the principles and techniques of Responsibility-Driven Design apply to real-world software designs.
You'll find coverage of such topics as:
As all experienced designers know, software design is part art and inspiration and part consistent effort and solid technique. Object Design: Roles, Responsibilities, and Collaborations will help all software designers--from students to seasoned professionals--develop both the concrete reasoning skills and the design expertise necessary to produce responsible software designs.
39 of 39 people found the following review helpful
Very Good Text on Object Design,
This review is from: Object Design: Roles, Responsibilities, and Collaborations (Paperback)I think I finally have a handle on object modeling-- 'Object Design' deserves a lot of the credit.
I have a shelf full of books on UML, uses cases, patterns, and modeling. I spent almost a year struggling through UML, trying to understand the nuances of sequence diagrams versus collaboration diagrams. Meanwhile, I felt no closer to being able to create serviceable object models for my projects.
Rebecca Wirfs-Brock and Alan McKean dispense with much of the tedious diagramming one usually associates with object modeling. Instead of charts and relationships, the book focuses on the roles, responsibilities, and behaviors that define an object. If you have ever assembled and managed employee teams, the framework will be very fmailiar. And that's where I found my breakthrough.
The book offers a good introduction to object modeling for those new to the area, and a solid reference for those looking to stremline their current methodology. The processes suggested by the authors are... Read more
20 of 20 people found the following review helpful
object design recommendation,
This review is from: Object Design: Roles, Responsibilities, and Collaborations (Paperback)I purchased this book a week ago, and am enjoying it immensely. This
is NOT a book by authors that rapidly churn out multiple books, and it
is NOT a book to be read quickly. It's clear that a lot of thought
has gone into every page and every sentence, and that you need to
reflect and compare with your own professional programming experience.
Despite the huge amount of information, I'm finding the book very
readable. The authors make a living consulting on architecture and
design, and know how to communicate.
There are some code examples in java, but the book is really language
A nice touch that I appreciated was the short summarizing side bars... Read more
17 of 17 people found the following review helpful
Definitive guide to Object Oriented Design,
This review is from: Object Design: Roles, Responsibilities, and Collaborations (Paperback)I've always believed the best approach to object-oriented design is Responsibility Driven Design (RDD), and this is the best book on the subject-written by the inventor of RDD.
I recently showed Mike Rosen, of Cutter Consortium, Object Design. Before I could say it had great chapters on RDD plus work on design for reliability and flexibility plus pages of references to related books and papers, he said 'Great! This will be my next book purchase'.
So, why is Object Design: Roles, Responsibilities, and Collaborations (OD) a really great book? These folks have years of design consulting and teaching experience, know what they are talking about, and are good at telling the story.
OD is a great read from cover to cover. Their two-chapter review of object design concepts was energetic, insightful, and comprehensive. From the beginning they are mixing in CRC cards (Thanks Kent, Ward!), architecture styles, patterns, and stereotypes into the discussion. This is the place to start for... Read more
› See all 14 customer reviews...
Online Sample Chapter
Table of Contents
Foreword by Ivar Jacobson.
Foreword by John Vlissides.
1. Design Concepts.
2. Responsibility-Driven Design.
3. Finding Objects.
6. Control Style.
7. Describing Collaborations.
8. Reliable Collaborations.
10. On Design.
This is a book about designing object software. Like many human endeavors, design is part art, part engineering, part guesswork and experimentation. Discipline, hard work, inspiration, and sound technique all play their parts. Although a highly creative activity, software design fundamentals can be easily learned. There are fundamental strategies and techniques for developing a design solution. This book is packed with many practical design techniques that help you get the job done. We hope you become adept at thinking in objects and excited about devising solutions that exploit object technology.
Design choices can only be considered in light of what you know to be relevant and important. To achieve good results, however, you need to learn to discriminate important choices from mundane ones, and to acquire a good set of techniques that you intelligently practice. In this book, we present informal tools and techniques that don't require much more than a white board, a stack of index cards, a big sheet of paper and chairs around a table. Oh yeah, be sure to bring your brain, too!
But more important than a grab bag of techniques are the fundamental ways you view a design. Although the techniques we present in this book are independent of any particular implementation technology or modeling language or design method; our approach to object design requires a specific perspective:
Objects are not just simple bundles of logic and data... they are responsible members of an object community.
This approach, called Responsibility-Driven Design, forms the basis of how to reason about objects.
Most novice designers are searching for the right set of techniques to rigidly follow in order to produce the correct design. In practice, things are never that straightforward. For any given problem there are many reasonable, and a few very good solutions. People don't produce identical designs, even if they follow similar practices or apply identical design heuristics. For each problem you approach, you make a different set of tactical decisions. The effects of each small decision accumulate. Your current design as well as your current lines of reasoning shape and limit subsequent possibilities. Given the potential impact of seemingly inconsequential decisions, designers need to thoughtfully exercise good judgment.
Your primary tool as a designer is your power of abstraction--forming objects that represent the essence of a working application. In a design, objects play specific roles and occupy well-known positions in an application's architecture. Each object is accountable for a specific portion of the work. Each has specific responsibilities. Objects collaborate in clearly-defined ways, contracting with each other to fulfill the larger goals of the application.
Design is both a collaborative and a solo effort. To work effectively you not only need a rich vocabulary for describing your design, but strategies for finding objects, recipes for developing a collaborative model, and a framework for discussing design trade-offs. You will find these tools in this book. We also explore how design patterns can be used to solve a particular design problem and demonstrate their effects on a design. We present you with strategies for increasing your software's reliability and flexibility. We discuss different types of design problems and effective ways to approach them. This book presents many tools and techniques for reasoning about a design's qualities and effectively communicating design ideas. Whether a student or a seasoned programmer, a senior developer or a newcomer to objects, there are many practical things you can take away from this book.How to Read This Book
This book is organized into two major parts. The first six chapters--Design Concepts, Responsibility-Driven Design, Finding Objects, Responsibilities, Collaborations, and Control Style--form the core of Responsibility-Driven Design principles and techniques.You should get a good grounding by reading these chapters.
Design Concepts introduces fundamental views of object technology and explains how each element contributes to a coherent way of designing an application. Even if you are a veteran designer, a quick read will set the stage for thinking about object design in terms of their roles and responsibilities. Responsibility-Driven Design provides a brief tour of Responsibility-Driven Design in practice. Finding Objects presents strategies for selecting and, equally important, rejecting candidate objects in an emerging design model. Responsibilities presents many techniques for coming up with responsibilities and intelligently allocating them to objects. Collaborations gives many practical tips and examples of how to develop a collaboration model. Control Style describes strategies for developing your application's control centers and options for allocating decision-making and control responsibilities.
The last four chapters explore challenges you may encounter as you develop your design. Each chapter covers a specific topic that builds on the design concepts and techniques presented in the first part of the book. Describing Collaborations explores options for documenting and describing your design. Reliable Collaborations presents strategies for handling exceptions, recovering from errors and collaborating within and across a "trusted region." Flexibility discusses how to characterize software variations and design to support them. On Design discusses how to sort design problems into one of three buckets--the core, the revealing and the rest--and treat each accordingly.
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