Research on assessing English as a foreign language (EFL) development has been growing recently. However, empirical evidence from longitudinal analyses based on substantial samples is still needed. In such settings, tests for measuring language development must meet high standards of test quality such as validity, reliability, and objectivity, as…

Although studies investigating online learning and teaching have proliferated recently, one area that has been underexplored is foreign language teachers' readiness to incorporate the flipped classroom into their repertoire at the K-12 level. Accordingly, the present study aims to provide an instrument to assess K-12 foreign language teachers'…