This study delves into the intricacies of multitasking by examining the transfer effects from dual-task to triple-task scenarios. Our research extends beyond conventional dual-task paradigms to explore the impact of triple-task performance on two participant groups: those untrained in single, dual, or triple tasks and those previously trained in single and dual tasks. Despite the initial advantage observed in the trained group, this advantage diminished throughout the sessions. Notably, both groups adopted distinct strategies for processing within the triple task, revealing the influence of task coordination on response times as the task set expanded. Our findings emphasize the significance of task coordination in multitasking scenarios, shedding light on the complexities involved in transitioning from dual to triple tasks. The study demonstrates that training can facilitate the transfer of skills acquired from specific tasks to others, with the formation of specific task sets playing a pivotal role in processing and coordination. Despite training, the persistence of multitasking costs challenges traditional assumptions about eliminating such costs through extensive practice. In conclusion, our research contributes to the current understanding of multitasking by highlighting the need for further exploration into inter(sub)task coordination and prioritization in multiple-task scenarios. The study underscores the complexities inherent in managing triple tasks and individuals' potential strategies. The findings advocate for ongoing refinement of cognitive models to accommodate the evolving nature of multitasking behaviors in real-world, complex environments.