On 12 August 2013, the Committee on Payment and Settlement Systems (CPSS) and the International Organisation of Securities Commission (IOSCO) published a report entitled Authorities' Access to Trade Repository Data. Trade Repositories (TRs) are entities that maintain a centralised electronic record of over-the-counter (OTC) derivatives transaction data. TRs play a key role in increasing transparency in the OTC derivatives markets by improving the availability of data to authorities and the public in a manner that supports the proper handling and use of the data. For a broad range of authorities and international financial institutions, it is essential to be able to access the data needed to fulfil their respective mandates while maintaining the confidentiality of the data pursuant to the laws of the relevant jurisdictions. This report provides guidance to TRs and authorities on the principles that should guide authorities' access to data held in TRs for typical and non-typical data requests. It outlines the expected data access needs of authorities using a functional approach complemented by an illustrative data access mapping that aligns each function to the minimum level of access authorities would typically require in support of their mandates and responsibilities. The report had been issued for public consultation in April 23, 2013. The finalised version being issued now has been revised in light of the comments received during that consultation.