Services trade

Methodology for Services Trade Restrictiveness Index


The STRI Methodology

The STRI scoring methodology uses binary scores. Most measures in the STRI regulatory database have binary answers (yes/no) and binary scores are applied directly. Measures that have numerical answers are broken down on thresholds to which binary scores are applied.

Some measures constitute hierarchies where one or a combination of a few measures would close a market segment or a mode of supply to foreign suppliers. In other cases a restriction on one measure would render others irrelevant. The scoring methodology captures such hierarchies by conditioning the scoring on measures on the answers to questions higher up in the hierarchy of measures.

Some measures are complementary. These are bundled together in the scoring methodology such that if one measure in the bundle is scored as a restriction, all of them are.

The methodology note explains the thresholds, hierarchies and bundling of measures. It starts with the horizontal measures that are included in all sectors, followed by sector-specific scoring methodologies.

» Download the free paper on STRI Scoring and Weighting Methodology (January 2015)
» Download the methodology note in PDF format
 (May 2014)
» Download all indices


Contact us

If you have any questions or comments about the OECD Services Trade Restrictiveness Index, please do not hesitate to contact us at


Quick links

Policy brief

Download the OECD policy brief containing analysis by our trade policy experts based on the conclusions drawn from the services trade restrictiveness index.

» Download the brief in English | French


Related Documents