1. Data entry operators prepare data for processing, usually by keying it into a computer.
2. Computer operators monitor the computer , review procedures, keep peripheral equipment running , and make backup copies of data.
3. Librarians catalog the processed disks and tapes and keep them in a safe and good condition.
4. Computer programmers design , write , test implement , and maintain the programs that process data on the computer system,: they also maintain and update the programs.