Experts K Hari, vice president of National Stock Exchange, Mukesh Agarwal, president of CRISIL, Abhay Bongirwar, MD and CEO, IDBI Capital markets, and AP Sarma, CEO, SIDBI Venture Capital Ltd, discuss how can we ensure that only credible companies with a sound business model come forward for raising capital through NSE's Emerge platform, and how critical ratings or grading are for such IPOs.