A Primary Health Care Informatics project was initiated in 1990 at Bhorugram, Rajasthan, India. It was reported in MIE91 with initial, encouraging results. The evaluation of the information system has been successful in all operational terms, and the Fully Immunised Child (FIC) could be used as a local cardinal index to monitor and evaluate the quality of care, cost-effectiveness and community participation. Health Systems and Health Economy Research alike have long searched for apt quality and performance markers that in themselves could embrace and express a number of aspects and factors. The FIC index is shown to well meet the criteria Of such a cardinal measure in the MCHC services. We, also, demonstrate an implementation strategy for establishing Information Systems in Primary Health Care Centres in Developing countries.