 The most well known of these projects is undoubtedly the Reproducibility Project: Psychology, coordinated by the now Center for Open Science in Charlottesville, VA (then the Open Science Collaboration). It involved 270 crowd sourced researchers in 64 different institutions in 11 different countries. Researchers attempted direct replications of 100 studies published in three leading psychology journals in the year 2008. Each study was replicated only once. Replications attempted to follow original protocols as closely as possible, though some differences were unavoidable (e.g., some replication studies were done with European samples when the original studies used US samples). In almost all cases, replication studies used larger sample sizes that the original studies and therefore had greater statistical power—that is, a greater probability of correctly rejecting the null hypothesis (i.e., that no relationship exists) when the hypothesis is false. A number of measures of reproducibility were reported: