Teacher professional development (PD) is among the most prominent levers used to improve teaching quality. The findings of research studies examining PD interventions are heterogeneous, with meta-analyses indicating mean positive impacts but also the existence of many ineffective programs. "Educational Researcher" has served as a…

The advent of online platforms such as Amazon's Mechanical Turk (MTurk) has expanded considerably researchers' options for collecting research data. Many researchers, however, express understandable skepticism of the viability of using platforms such as MTurk. In this article, we provide a background on the use of MTurk as a mechanism for…