44-year-old Cyrus Mistry takes over the reins of the $100 billion Tata group today. The task of spearheading a diversified conglomerate amid global economic slowdown and new challenges like corruption and slow government decision-making will not be easy. It will be a trial by fire, whether in terms of adjusting the group's strategy in economically challenging times or fixing individual business lines. The biggest challenge may be living up to the legacy of Ratan Tata.