This article presents a theoretical review of and methodological guidelines for the study of two key notions in second language acquisition research, complexity and difficulty. The term "complexity" has gained considerable currency over the past decades and has taken on a wide range of meanings. We argue for a more restricted…

In recent years, first responders have faced increasing challenges in their operations, highlighting a growing need for specialized and comprehensive training. In particular, the firefighting incident commanders (ICs) are playing a pivotal role, providing directions to field operators and making critical decisions in emergency situations. Over…

'Programa de Especialização Docente Brasil' (PED Brasil) is a learning and professional development program in mathematics or science education for primary or secondary in-service schoolteachers. Designed to be a teacher education program that addresses issues related to educational quality and equity in racially, socially, and academically…

Access to core subject-area curriculum for students from immigrant backgrounds who are learning the dominant language of instruction has long been a barrier to equitable education around the world, especially in secondary schools. This article explores the promise of Complex Instruction (CI) to address barriers to access for such multilingual…