To facilitate the implementation of the global indicator framework, all indicators are classified by the IAEG-SDGs into three tiers on the basis of their level of methodological development and the availability of data at the global level, as follows:
Tier Classification Criteria/Definitions:
Tier 1: Indicator is conceptually clear, has an internationally established methodology and standards are available, and data are regularly produced by countries for at least 50 per cent of countries and of the population in every region where the indicator is relevant.
Tier 2: Indicator is conceptually clear, has an internationally established methodology and standards are available, but data are not regularly produced by countries.
Tier 3: No internationally established methodology or standards are yet available for the indicator, but methodology/standards are being (or will be) developed or tested.
All indicators are equally important, and the establishment of the tier system is intended solely to assist in the development of global implementation strategies. For tier I and II indicators, the availability of data at the national level may not necessarily align with the global tier classification and countries can create their own tier classification for implementation.
Please note that Tier I and II indicators’ metadata are available in the metadata repository. Tier III indicators require work plans to be developed outlining the methodological development of the indicators for approval by the IAEG-SDGs. The current Tier III work plans are available here.
Below, please find the updated tier classification as of 19 April 2017 for the Global SDG indicators as developed by the IAEG-SDGs. The tier classification for 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.
For any future requests to add an agency as a co-custodian, once all parties have reached final agreement, please send the confirmation to the Secretariat with copy to all possible custodian agencies.
As of 19 April 2017: The updated tier classification contains 82 Tier I indicators, 61 Tier II indicators and 84 Tier III indicators. In addition to these, there are 5 indicators that have multiple tiers (different components of the indicator are classified into different tiers).