4. Interval for revision of variable dearness allowance.
The cost of living allowance and the cash value of the concession in respect of essential commodities at concession rate shall be computed once before 1st April and then before 1st October in every year to revise the variable dearness allowance payable to the employees on the minimum wages considering the Average Consumer Price Index Number for Industrial Workers published by the Labour Bureau, Ministry of Labour and Employment, Government of India.