This document discusses the evolution of health care information systems over the past 20 years. It notes that 20 years ago, many hospitals lacked technologies that now exist, which led to issues like medical errors, lost documentation, time-consuming paperwork, and poor data collection. The document then outlines some of the key changes in health IT over this period, including the adoption of electronic health records, increased use of computers for billing and documentation, and integration of systems across organizations to improve data sharing and care coordination.