I personally have not started this project, yet, but I have discussed this with colleagues.
It would involve a chart review of one or more primary pediatric health care practices (pediatrics or family medicine). Measurables would include at least some of the following: The number of infants and toddlers seen for health maintenance (well-child) visits; the number of those were screened for development using a standardized instrument; the number of those with concerns warranting referral; the number of those who were actually referred; the number of those who were found eligible for early intervention services; the number of those referred were seen for followup within 2 months.
This project could be done as part of a quality improvement project for the practice.
The results could be used to help particular practices assess the effectiveness of their developmental screening and referral processes.