This ongoing book project, edited by Nikolai Veresov and Samran Daneshfar and developed for Springer, addresses a key methodological challenge in cultural-historical research: the need for a contemporary, coherent research methodology grounded in Vygotsky’s experimental-genetic method. Bringing together contributions from several researchers, the volume responds to social, cultural, and digital transformations of the 21st century and advances a refined cultural-historical research methodology applicable across diverse cultures, educational contexts, and age groups. Through theoretical, empirical, and experimental chapters, the book demonstrates how research questions, design, data collection, and analysis can be integrated within a unified methodological logic, offering robust tools for researchers, postgraduate students, and educators.