In the first, the computer functions as a tutor. In the second, the computer functions as a tool. In the third, the computer functions as paychecks a tutee or student. To function as a tutor in some subject, the computer must be programmed by “experts” in programming and in that subject. The computer is one of the wonders of human ingenuity. With the invention of the microcomputer (now also commonly referred to as PCs or personal computers), the PC has become the tool for programmed instruction.