I started developing accounting information systems in an Apple II when I was 15 years old. Very soon after that I had strong conversation with the Comptroller of several banks regarding how accounting should be done. I continued developing information systems that evolved into comprehensive ERPs. In the past year, my co-author, Dr. Ricard Salim and I have been developing a model that we call Items-Agents-Cash (IAC) which facilitates the development of computerized accounting systems. The model has evolved considerably since it was first developed and it is currently in use in tens of accounting information systems.