Four authors each analyze a different nuclear "regime" which might govern the role of nuclear weapons in the 1980s. Mandelbaum argues strongly for preservation of existing U.S.-Soviet mutual deterrence and nuclear predominance, and Garwin for a significant reduction in the role of nuclear weapons - even if this requires unilateral restraints. Barton discusses a nuclear-tree world, but discounts its likelihood, and Gompert analyzes the consequences of increased nuclear competition and proliferation. Garwin's argument is the most intriguing, but in the end Mandelbaum is the most convincing. As a whole, the book provides the best insight yet into the tremendous complexities of the current nuclear balance and the few alternatives our policymakers face for the 1980s.