This document contains the updated tier classification, based on changes made by the Inter-agency and Expert Group on SDG Indicators (IAEG-SDGs) following its 3rd (March 2016), 4th (Nov. 2016) and 5th (March 2017) meetings. The tier classification of many indicators is expected to change as methodologies are developed and data availability increases. Therefore, the IAEG-SDGs has developed a mechanism to annually review the tier classification at its Fall (or 4th quarter) meetings. The updated tier classification is expected to be released following those meetings unless otherwise noted. Also reflected in the document are the possible custodian and partner agencies for the indicators.
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