Incorrect PIN http://videox.site/ xvideos Yet after decades of research we have little understanding of what makes educators effective. Observable characteristics, including teacher qualifications, generally have no or very small effects. This is a remarkably consistent finding in most rigorous studies worldwide. If there’s anything research in the economics of education has disproved, it’s the theory that teachers with specific qualifications perform better than those without. Most people might also find this intuitive since practically everybody has probably experienced good unqualified teachers and bad qualified ones (and vice versa).