User Stories Applied: For Agile Software Development [Paperback] Author: Mike Cohn | Language: English | ISBN:
0321205685 | Format: PDF, EPUB
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The concept of user stories has its roots as one of the main tenets of Extreme Programming. In simple terms, user stories represent an effective means of gathering requirements from the customer (roughly akin to use cases). This book describes user stories and demonstrates how they can be used to properly plan, manage, and test software development projects. The book highlights both successful and unsuccessful implementations of the concept, and provides sets of questions and exercises that drive home its main points. After absorbing the lessons in this book, readers will be able to introduce user stories in their organizations as an effective means of determining precisely what is required of a software application.
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- Paperback: 304 pages
- Publisher: Addison-Wesley Professional; 1 edition (March 11, 2004)
- Language: English
- ISBN-10: 0321205685
- ISBN-13: 978-0321205681
- Product Dimensions: 9.2 x 7 x 0.6 inches
- Shipping Weight: 1 pounds (View shipping rates and policies)
'User Stories Applied' was a book that long stood on my Amazon wish list with a 'must have' rating. I'm not disappointed. I loved the book. Now let me explain why.
First of all, running the planning aspect of an XP project, for example, well is essential for reaping the benefits of agile software development. Yet, relatively little has been written to guide practitioners in doing that. I, for example, have made all the mistakes Cohn enumerates in the chapters for guiding the user towards writing *good* user stories (usually more than once). These sorts of things make you realize you shouldn't put the book on the shelf to gather dust! The author doesn't cover just writing good user stories, but the whole spectrum from putting together the customer team to estimating stories to discussing the stories to writing acceptance tests for the stories.
Second, it's a pleasure to read. The structure makes sense, each chapter is followed by a useful summary, and there's a set of questions -- along with answers -- to make sure you understood what the chapter talked about. Usually these kinds of Q&A sections simply force me to skip them over. The questions in this book did not. I read each and every one of them and I think there was only one set of questions that I did 'pass' with the first try, usually having forgotten some rather important aspects to consider (concrete evidence of their usefulness to me). To finish, the last part of the book, an example project, nicely ties together all the threads.
As usual, there were some things I experienced not so well. I believe the chapter on applying user stories with Scrum could've been left out without breaking the plot.
Writing user stories is one of the twelve practices of the XP software development methodology. User stories summarily describe features of the software that must be developed, from the point of view of the user. This means that no implementation detail is present on stories.
As with all the XP practices, the emphasis is on traveling light, producing only those artifacts that are absolutely necessary. Thus, user stories contain a brief description of the feature as a reminder, to the developers and to the customer, that sometime in the future they will need to meet and flesh out the details. This is in contrast to techniques like use cases, which might seem similar but are much more formal and rich.
User stories also play a fundamental role in the planning game, one of the other XP practices. During the planning game, the development team and the customer together discuss the stories, the developers estimate the time necessary to implement each story, in terms of story points and the customer prioritizes them. During the next iteration, developers will implement those stories that the customer deemed more urgent, up to a number whose total sum of points does not exceed the estimated team velocity.
All of this is explained in a couple of the XP series books, namely Extreme Programming Explained: Embrace Change and Planning Extreme Programming You'd better have already read at least the former of those before picking up Mike Cohn's book.
User Stories Applied does a good job explaining in detail what user stories are, what goes into them -and what doesn't -, how they should be estimated and what to do with them after the stories have been implemented.
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