This chapter explores the interdisciplinary dimensions of Applied Cognitive Task Analysis (ACTA), highlighting its integration with cognitive science, psychology, and organizational studies. It examines how ACTA benefits from advancements in these fields, showcasing its versatile applications across healthcare, education, and technology. By exploring these cross-sectoral applications, the chapter illustrates the mutual benefits of ACTA's collaboration with diverse disciplines, enhancing its effectiveness and impact. Specific examples demonstrate how ACTA methodologies address complex problems, contributing to scientific knowledge while gaining insights from various research perspectives. This comprehensive overview emphasizes how interdisciplinary contributions enrich ACTA and offers insights into future research and practical applications.