AFTER DEFINING COMPUTER CRIME AS THE MOST LUCRATIVE OF ALL CRIMES, THE AUTHOR ILLUSTRATES HIS QUALIFICATION WITH EXAMPLES OF COMPUTER FRAUD THAT WERE PERPETRATED BY MODIFICATION OF COMPUTER INPUT SOURCE DOCUMENTS SUCH AS VOUCHERS, CLAIM TRANSACTIONS, AND KEYPUNCH CARDS. ALSO COVERED ARE DOCUMENT AGE INDICATORS, TEXTUAL CONTENT, PHOTOCOPYING, AND WRITING MEDIA. A COMPUTER FLOW CHART ILLUSTRATES VARIOUS POINTS IN A COMPUTER ORIENTED PROCESS WHERE FALSIFICATIONS CAN BE INTRODUCED.