This book is not for the faint-hearted in terms of both its difficulty and its message, and it's all the more rewarding for it. Bob Jessop outlines and demonstrates the body of his work on the state, providing a complex, multi-theoretical method for studying the state and defining the state and in its many forms and contexts, arguments demonstrating the method, in depth arguments on state theory, the state as it functions today, and methodological and substantive thoughts on the future of the state and the state system.
Long term students of the state will likely find much to sink their teeth into, whether in terms of future research, new methods or approaches to the states study, or by way of disagreement with Jessop's argument and conclusions. However, as relative newcomer to state theory I'd like to give some thoughts on its value to new students of the state, and particularly to political philosophers and normative political theorists (my own field).
Despite its difficulty, a number of themes appear throughout the book which should be of interest to the three categories just mentioned. To name just a few: (1) the contingent (and always apparent) unity of the state; (2) the contingent nature of the state form; (3) state power as a contextualised, contingent, and multi-faceted outcome of the prevailing balance of forces; (4) the state as an ensemble of institutions; and finally, (5) the role of 'state projects' and the state idea.
The first theme is of value because in much political theory the state is very often treated as simply a unitary actor either with benign or beneficial aims representing the popular will and maintaining the conditions required to flourishing, or as a simple vehicle for domination by a unified interest-group. Jessop's book teaches one to be skeptical of any such assertion and provides the resources to challenge it. Likewise, the second theme cautions against assuming any particular form to the state and that it necessarily has a particular form (usually, simply authoritarian, totalitarian, liberal-democratic, socialist, and so on). Here again, the book cautions against such assumptions, paving way for skepticism towards approaches treating the state as simply a positive or negative phenomenon.
The third theme shows the complex way in which power functions in the state and the myriad ways in which it can be used to dominate various sub-sections of society. Notably, Jessop argues that 'the state does not (and cannot) exercise power' (247). This, like the previous two themes, warns political philosophers against the simple (and very common) assumption that what we are normatively concerned with is the exercise of power by a unified body. Instead, state power is complex, wielded by multiple actors at multiple levels (the fourth theme). This suggests that political philosophy concerned with the justification of state power needs more depth and more real-world analysis of state power to avoid resorting to over-simplified pictures of reality in presenting the case for some normative outcome.
Fifth, and finally, the notion of state projects or state ideas importantly introduces the role of ideas and ideology into the study of the state. Of course, this is not new. However, the significant contribution Jessop makes (and whether this is fairly new, I don't know), is that the idea of the state and the state project must be included in its definition. Further, by means of these concepts Jessop's introduces notions of 'the common good' and 'general will' into the discussion of the state, showing how they intersect with questions of 'real' interests (my notion-loosely defined), legitimacy, and power. This will be of immediate interest to political philosophers and normative political theorists who here find arguments as to why such notions might always be partial and illusory.
I removed a star because it is, at times, needlessly complex and could certainly have avoided much of the jargon clogging the pages. It also could use more examples, less sketchily treated to drive home and further demonstrate the book's main claims. This is a very difficult book, densely packed with ideas and terms, but one that will ultimately reward close reading.