Additionally, he was a member of several government committees on disabilities and a visiting professor at numerous universities abroad. Professor Jeyachandran made significant contributions to the field of Intellectual Disability (ID), particularly in developing training programs and behavioral assessments for individuals with ID. He also created curricula for training programs aimed at special educators. With support from parents, he established Vijay Human Services to provide a comprehensive array of services for individuals with mental retardation.In 1975, he co-authored the Madras Developmental Programming System (MDPS) with Professor V. Vimala, which is a criterion-referenced scale used for assessment and program planning for individuals with intellectual disabilities. The scale consists of 360 items grouped into 18 areas or domains, each containing 20 items. This initiative marked the development of the first comprehensive behavioral scale in India.