The first computer-like machine is the Mark I, built by a team from IBM and Harvard University under the leadership of Howard Aiken. The Mark I used mechanical telephone relay switches to store information. The machine accepted data on punched cards, processed it, and then output the new data. Since it could not make decisions about the data, it was really not a computer. Instead, it was a highly sophisticated calculator. It was 52 feet long, weighed 50 tons, and had 750,000 parts, many of them moving mechanical parts which made the Mark I not only huge but unreliable.
