Shan Carter and Michael Nielsen:

Historically, different answers to this question – that is, different visions of computing – have helped inspire and determine the computing systems humanity has ultimately built. Consider the early electronic computers. ENIAC, the world’s first general-purpose electronic computer, was commissioned to compute artillery firing tables for the United States Army. Other early computers were also used to solve numerical problems, such as simulating nuclear explosions, predicting the weather, and planning the motion of rockets. The machines operated in a batch mode, using crude input and output devices, and without any real-time interaction. It was a vision of computers as number-crunching machines, used to speed up calculations that would formerly have taken weeks, months, or more for a team of humans.

In the 1950s a different vision of what computers are for began to develop. That vision was crystallized in 1962, when Douglas Engelbart proposed that computers could be used as a way of augmenting human intellect. In this view, computers weren’t primarily tools for solving number-crunching problems. Rather, they were real-time interactive systems, with rich inputs and outputs, that humans could work with to support and expand their own problem-solving process. This vision of intelligence augmentation (IA) deeply influenced many others, including researchers such as Alan Kay at Xerox PARC, entrepreneurs such as Steve Jobs at Apple, and led to many of the key ideas of modern computing systems. Its ideas have also deeply influenced digital art and music, and fields such as interaction design, data visualization, computational creativity, and human-computer interaction.