Dearness Allowance is of two types, one which is revised quarterly based on CPI, and the other revised semi-annually. Both these aim to mitigate inflation effects for households of central government employees. Dearness Allowance is of two types, one which is revised quarterly based on CPI, and the other revised semi-annually. Both these aim to mitigate inflation effects for households of central government employees. by Soban News (international And National News)