From the 61 indicators presented in the two TALIS 2018 Reports, we constructed indices on the education quality, based on the teachers’ and principals’ opinions, by country/economy, for the 10 themes of these Reports. The indices result from the association between the OECD perspective on indicators’ influence on the education quality and whether each country’s score was statistically above, below, or not different from the OECD average. We found that (a) teachers from OECD-members have a positive opinion only in three themes and the principals have a better opinion than teachers; (b) teachers and principals from OECD-partners have a positive or neutral opinion in all themes; (c) professionals with a strong positive opinion on the learning environment and working conditions are mostly from Asia; (d) professionals with a clearly negative opinion are mostly from Europe; and (e) there are only two significant correlations between these indices and PISA 2018 results in the three domains simultaneously: (i) teachers’ opinions index about Student behaviour and classroom management (negative correlation); (ii) and principals’ opinions index about Learning environment (positive correlation).