'The work's strength lies in its analysis of the technology, and it is particularly good on the importance of different degrees of definition and on the different types of sensors available. It is a useful read for those interested in the strengths and limitations of different verification techniques, and Bhupendra Jasani's opening essay is a model of clear information in an area where the superpowers still like to keep their detailed capabilities concealed.'Trevor Taylor, Staffordshire Polytechnic. International Affairs