 An important task of the CTBTO is to explore how recent scientific and technical advances in these technologies can be applied to an OSI.In addition to the IMS, C&C and OSI, the verification regime of the CTBT includes also the fourth element of Confidence-Building Measures.This requires States Parties to the treaty to notify the Organization, if possible in advance, of any chemical explosion using 300 tonnes or greater of TNT-equivalent blasting material to be detonated.