Applied Cognitive Task Analysis (ACTA) is a robust methodology for understanding and improving complex cognitive tasks across various fields. This paper explores two key dimensions of ACTA: innovative approaches and interdisciplinary contributions. The first section delves into cutting-edge techniques and methodologies that enhance the efficacy and applicability of ACTA in diverse contexts, from military operations to healthcare and education. The second section examines the interdisciplinary contributions to ACTA, highlighting how insights from cognitive science, psychology, human factors, and other disciplines enrich its methodologies and expand its applications. By integrating innovative approaches and interdisciplinary insights, this paper demonstrates how ACTA can optimize task performance, enhance learning and training programs, and address complex cognitive challenges in various sectors. The findings underscore the versatility and impact of ACTA, positioning it as a critical tool for advancing human performance and understanding in an increasingly complex world.