The obvious caveats to this exercise are how far the government is prepared to ensure the independence and credibility of the data. The DIPP is an arm of the government and the rating system should be so robust that it should always remain immune to political pressure to present data in ways that might suit the ruling regime. This is also true, of course, of the National Institution for Transforming India, or NITI, Aayog, which could be part of this or a related endeavour. Though it is not strictly comparable, the example not so long ago of the head of a Congress-affiliated think tank being pressured after the institution published data showing Gujarat leading an index of economic freedom should be borne in mind.
The methods used, however, should be immune to common problems with such rankings. For example, relying on self-filled questionnaire answers from state bureaucrats - apparently the currently preferred method from DIPP - will lead to rankings with only a tenuous link with reality. Instead, a genuine investigation of the nature of the laws and processes that lie behind the self-assessments will be necessary. The DIPP officials claim a ranking of this nature will trigger "healthy" competition among states. It must then be designed to avoid promoting unhealthy competition - competitive giveaways and tax breaks of the kind offered for the Tata Nano car project in West Bengal and later Gujarat that could be detrimental to some states' financial stability. The ranking would also do well to go beyond the standard matrix and parameters used by the World Bank to include assessments of political stability and availability of quality social infrastructure, both of which are as critical to a corporation's investment plans as land acquisition and inspection regimes, as the former chief minister of West Bengal, Buddhadeb Bhattacharjee, discovered in his state in 2011 and Nitish Kumar may have begun to realise in Bihar.