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Product Description
Product Description
Well-written requirements are crucial to systems of all kinds: you are unlikely to get what you want unless you ask for it. This book explains and demonstrates exactly what requirements are for, and how to write them
About the Author
Ian Alexander is an independent consultant specialising in Requirements Engineering. He has written several training courses on systems and requirements engineering. He has led hundreds of training courses on systems engineering, requirements, DOORS, and DXL, and has run numerous practical workshops on scenarios, trade-offs and requirements. He was co-author of an Addison-Wesley book on HTML 3 and its 2nd Edition on HTML 4. He is the author of the Scenario Plus for Use Cases toolkit, and is a well-known speaker and writer on scenario usage. He is currently on a technology project to investigate the reuse of specifications for control systems in the German automobile industry. He helps to run the BCS Requirements Engineering Specialist Group and the IEE Professional Network for Systems Engineering. He is a Chartered Engineer.
Richard Stevens is the founder of QSS, the firm that launched the pioneering Requirements Management tool DOORS, the world’s most popular requirements tool. He is the co-author of books on "Systems Engineering", "Software Engineering Standards", "Software Engineering Guidelines" and "Understanding Computers". In 1998, Richard was appointed as the first European Fellow of INCOSE, the International Council on Systems Engineering.
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Customer Reviews
The book focuses on what is often the weakest area in requirements writing: the expression and organisation of user requirements - those that come before system requirements, and which describe more of the problem to be solved than of the system that is to be the solution. It uses the concept of scenarios as a means of obtaining and organising requirements. Indeed, the book is itself structured almost as a mini scenario, in which stakeholders are identified, interviewed; requirements documents are structured; requirements statements are written; and all is reviewed.
Because the book is about writing requirements rather than managing them, there are many topics it chooses not to cover in any detail. Examples are requirements traceability and managing change in requirements. However, there is an excellent annotated "further reading" list at the end, which has the merit of not being too long.
The only criticism I have concerns the example requirements in the appendix. I find it hard to identify the actual requirements from amongst the elements of the scenarios. Examples in the book sometimes use the affirmative "shall" to indicate a statement of requirement, sometimes just the present tense, e.g. "The pilot controls the aircraft's angle of climb with one hand." In the appendix, the word "shall" seems to be avoided completely, and, left only with the present tense, it is difficult to distinguish scenario steps from requirements. Are the statements "Call center operator tries to disconfirm intrusion by calling householder" and "Alarm notifies failure to call center" both requirements on the burglar alarm?
In summary, "Writing Better Requirements" should be on every requirements engineer's desk (not shelf!) It could and should serve as a constant reminder of some common sense principles that lead to a more effective expression of requirements.
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