If quality is measured by test scores, teachers and administrators have an incentive to cheat. The Chicago and Atlanta school systems suffered scandals from widespread cheating. If quality is measured by direct observation, the observations tend to be highly favorable., What is quality teaching? Why does quality teaching matter for educational justice? What does a system that provides quality teachers for all students look like? What are key policies to create such a system? © Linda Darling-Hammond 2010, Drawing on modern validity theory, Gitomer judges measures based on three broad facets: (1) the domain of teaching quality, (2) the nature of evidence collected and analyzed, and (3) the process of interpreting evidence to support inferences., This issue of EAEA focuses on educational quality regarding (1) measuring teaching quality across countries and regions, (2) designing tests and test formats and (3) providing and transforming feedback to teachers and migrant students for learning and change., Measuring teaching quality is challenging to say the least. Each instructor brings his/her training, experience, style, and capabilities to the classroom, making it notoriously difficult to establish a fair teaching quality metric., .