Purpose-Countries that can adapt to the pace of technological developments, follow and use this speed have a stronger economy and obtain a significant competitive advantage in the global arena. Therefore, the countries make various regulations to increase the technological achievements, access to the global technologies, adapt to the rapid technological transformation and organize their substructures according to these technologies. Technology Achievement Index (TAI), which is one of the studies to evaluate the technological performance of countries, classifies countries according to their technological achievements. Conclusion-According to TAI-16 classification, the countries were identified as follows; 40 countries as Leaders, 38 countries as Potential Leaders, 17 countries as Dynamic Adopters, and 10 countries as Marginalized. Furthermore, TAI ranking of the 105 countries was created. In this classification, while Switzerland had the highest with 0.813 TAI value, Ethiopia had the lowest value with 0,028 TAI value.

Purpose-Information and communication technologies have a strong influence on sustainable economic growth and global competition. The countries that adapt to the speed of these technologies and have skills, infrastructure and accessibility to use these technologies will benefit from the strong influence of ICT. Various analyses, measurements, and comparisons are made to measure this effect. Methodology-Information and Communication Technologies (ICT) Development Index prepared annually by the International Telecommunication Union (ITU) is a composite index calculated from eleven indicators to monitor developments in the field of ICT and make the comparison between countries. Findings-In this study, the efficiency of the indicators in the ICT Development Index (IDI) in OECD countries was examined by data envelopment analysis. Conclusion-By evaluating the relative effectiveness of the countries, the efficiency scores and reference values were determined for 2015.