As per CBEC Circular no.36/2011-Cus dated August 12, 2011, the parameters are that the unit should have achieved NFE/export obligation wherever applicable and the unit should not have been issued a show cause notice or a confirmed demand, during the preceding three years, on grounds other than procedural violations, under the penal provision of the Customs Act, the Central Excise Act, the Foreign Trade (Development & Regulation) Act, the Foreign Exchange Management Act, the Finance Act, 1994 covering Service Tax or any allied Acts or the rules made thereunder, on account of fraud/collusion/willful misstatement/ suppression of facts or contravention of any of the provisions thereof.