Discovering Requirements: How to Specify Products and Services (Paperback)

I think this is currently the best book available on requirements engineering. The structure of the book is a little odd but the practical advice, quality of writing and explanation are unparalleled. It is particularly good if you are involved in developing products for style such as software package or an embedded system. Many business analysis courses and books taken approach of business improvement within the organisation this takes approach which is more geared to identifying and specifying requirements for a product. This is very good value at £20

Business Analysis Techniques: 72 Essential Tools for Success (Paperback)

This book complements the "Business Analysis" book by Debra Paul and Don Yeates, that you already have, very well. Each technique is well explained with some practical examples but no integrated case study. As far as the requirements type techniques of business analysis I think you are better served by the Ian Alexander book or the other requirements books. For the more business and change orientated techniques of business analysis the book is an excellent. However I think there are some key techniques that are missing from this book -- one I'd pick out in particular is the glossary. It's very useful for the ISEB courses as all the authors are examiners, trainers and syllabus writers for the ISEB qualifications.

Writing Effective Use Cases (Crystal Series for Software Development) (Paperback)

Alistair Cockburn is one of the best writers on agile and software development. This book is really the Bible on writing use case descriptions. He doesn't really consider the diagrams and I would agree that by far and away the most useful aspect of use cases is the writing and validation of the descriptions. Full of practical tips and detailed explanation this takes you a long way beyond what is in the standard UML and requirements books. Really useful if you find yourself working on a project where you were writing use case descriptions if -- often needed in large business analysis/requirements engineering software development projects.

Software Requirements 2nd Edition (Pro-Best Practices) (Paperback)

A very well written book that covers all of the basics of requirements engineering. Everything is very well explained with some nice practical examples and an integrated case study -- further information can be gained from the useful website that accompanies the book. The approach is a little old-fashioned (though this is true of most requirements engineering books) and does not really consider agile techniques sufficiently.

The Software Requirements Memory Jogger: A Pocket Guide to Help Software and Business Teams Develop and Manage Requirements (Spiral-bound)

This is a neat little book which demonstrates 100 or so invaluable techniques for business analysis and particularly requirements work. It has a great simple format which demonstrates each technique through the same case study. Although the book is only small there is a massive amount of detail. Pity Amazon have just put the price up, I used to say you couldn't buy anything better than less than a tenner.