Functional analysis is the gold standard for assessing challenging behaviors in Applied Behavior Analysis (ABA), particularly important for neurodivergent populations such as individuals with autism. Despite its efficacy, functional analysis needs to be more utilized due to its complexity, time demands, and potential to evoke dangerous behaviors. The Interview-Informed Synthesized Contingency Analysis (IISCA) addresses these issues by offering a faster, less traumatic alternative requiring fewer challenging behaviors. This study aimed to teach IISCA to professionals working with autistic individuals through an asynchronous online training program using Behavioral Skills Training (BST). Thirty professionals participated in theoretical instruction, modeling, rehearsal, and feedback via Google Classroom. Results showed significant improvement, with correct responses increasing from 52% pre-intervention to 82% post-intervention. After multiple attempts, most participants successfully applied IISCA with clients, underscoring the need for iterative learning and feedback. This study demonstrates the efficacy of asynchronous online training in teaching IISCA, providing a flexible, accessible method for training professionals, especially in remote or underserved areas. Future research should explore integrating synchronous elements to enhance learning and investigate the long-term impact on client outcomes.