The publications listed below provide useful information, frameworks and techniques

• Benefits Management: Delivering Value from IS and IT Investment, by John Ward and Elizabeth Daniel (Wiley)
  (ISBN 9780470094631)
• Benefits Realisation Management, by Gerald Bradley (Gower)
  (ISBN 9780566086878)
• Business Analysis Techniques: 72 Essential Tools for Success, by James Cadle, Debra Paul and Paul Turner (British Computer Society)
  (ISBN 190612423X)