In the current global scenario, an essential pre-requisite of trade is that any product or service accepted formally in one economy must also be free to circulate in other economies without extensive re-testing. WTO recognises that non-acceptance of test results and measurement data is a technical barrier to trade. Accreditation is considered as the first essential step for facilitating mutual acceptance of test results and measurement data. NABL has been established with the objective of providing Government, Industry Associations and Industry in general with a scheme of Conformity Assessment Body’s accreditation which involves third-party assessment of the technical competence of testing including medical and calibration laboratories, proficiency testing providers and reference material producers.The laboratory accreditation services to testing and calibration laboratories are provided in accordance with ISO/IEC 17025: 2017 ‘General Requirements for the Competence of Testing and Calibration Laboratories’. ISO/IEC 17025:2017 is an international standard that sets outs the general requirements for the competence of testing & calibration laboratories. This third edition cancels and replaces the second edition (ISO/IEC 17025: 2005), which has been technically revised.