The document is a letter from Parag Basu, Deputy General Manager of SEBI, to the Managing Directors of all stock exchanges in India. It directs the stock exchanges to amend their listing agreements to replace the existing Clause 49 with a revised Clause 49 on corporate governance. It provides details on the implementation schedule and ongoing compliance requirements for listed companies. It also specifies the role of stock exchanges in monitoring compliance and reporting to SEBI.