CHICA System: CHICA is comprised of: (1) a knowledge base of pediatric guideline rules; (2) a repository of patient data; (3) a tablet user interface; and (4) an interface to the existing electronic medical record system. The result is a system that both delivers "just-in-time" patient-relevant guidelines to PCPs during the clinical encounter and captures accurate structured data from all who interact with it. In the waiting room caregivers complete a prescreening form (PSF), available in English and Spanish, consisting of a series of twenty surveillance questions tailored to the child's age and past history. A positive response to a question may trigger additional follow-up questions. During the clinic visit, relevant feedback from caregiver responses and information about clinical guidelines are displayed prominently on a provider worksheet (PWS) in the electronic health record.