In each domain, the authors seek answers to these questions: Who is ahead? By how much? and Why? The authors find that India has distinct advantages over China in terms of demographics; that the two countries are surprisingly close in terms of forecasted economic growth, although China's overall economic output is likely to remain significantly higher than India's; and that, for both science and technology and defense spending and procurement, China's current substantial margins over India are likely to rise but by amounts that will vary widely depending on several alternative scenarios. The monograph concludes with implications for policy and for further research.