The...500 largest companies in India...based on data from the Bombay Stock Exchange (www.bseindia.com) as on August 2009...are rated from Level 0 to 5 (Level 5 being the highest)...The CSR Rating is assigned based on the CSR initiatives of the company for the time period of the study, including a comparison with previous CSR initiatives...The Karmayog CSR Rating of any company is open to change whenever new information is provided by the company or from any other source.