Computers in the classroom include any digital technology used to enhance, supplement, or replace a traditional educational curriculum. As computers have become more accessible, inexpensive, and powerful, the demand for this technology has increased, leading to more frequent use of computer resources within classes, and a decrease in the student-to-computer ratio within schools. Computers in the classroom include any digital technology used to enhance, supplement, or replace a traditional educational curriculum. As computers have become more accessible, inexpensive, and powerful, the demand for this technology has increased, leading to more frequent use of computer resources within classes, and a decrease in the student-to-computer ratio within schools. College campuses used computer mainframes in education since the initial days of this technology, and throughout the initial development of computers. The earliest large-scale study of educational computer usage conducted for the National Science Foundation by The American Institute for Research concluded that 13% of the nation's public high schools used computers for instruction, although non-users still outnumbered users at a ratio of 2 to 1. The study also concluded that computers proved to be very popular with students, and that applications run on early models included sports statistic managers, administration tools, and physics simulators. In 1975, Apple Inc. began donating Apple 1 model computers to schools, and mainframes began to lose their former dominance over academic research. Computer usage continued to grow rapidly throughout this era. In 1977, it was estimated that over 90% of students at Dartmouth College had used computers at some point in their college careers. Walter Koetke, the director of a Lexington, Massachusetts school system commented that, 'It's still possible for a student to get through here without using the computer, but he would certainly have to try to do it'. Computer-aided instruction gained widespread acceptance in schools by the early 1980s. It was during this period that drilling and practice programs were first developed for exclusive classroom use. Schools became divided over which computer manufacturers they were willing to support, with grade schools generally using Apple computers and high schools preferring DOS based machines. Hardware shortages in schools became a major issue, leaving many teachers unable to provide enough computers for students to use. Despite this, by 1989 computer usage shifted from being a relative rarity in American public schools, to being present in nearly every school district. The early 1990s marked the beginning of modern media technology such as CD-ROMs as well as the development of modern presentation software such as Microsoft PowerPoint. Other computer-based technology including the electronic whiteboard and the laptop computer became widely available to students. In 1990, the Methodist Ladies' College became the first campus to require every student to purchase a laptop. Governments around the world began to take notice of the effectiveness of this policy, and began financial initiatives to significantly increase the use of laptop computers in other colleges as well. In 1996, Bill Clinton made over $2 billion in grants available in the Technology Literacy Challenge Fund, a program which challenged schools to make computers available to every student, connected to the outside world, and engaging. This marked a significant increase in the demand for computer technology in many public school systems throughout the globe. Correlating with the development of modern operating systems like Windows 98 and the continuing support of government funding, the prevalence of educational computer usage boomed during this era. Between 1997 and 1999, the ratio of students to multimedia computers decreased from 21 students per machine to less than 10 students per machine. Colleges began creating specialized classrooms designed to provide students with access to the utilization of the most modern technology available. Classrooms such as the 'Classroom 2000' built at Georgia Tech in 1999 which featured computers with audio and video equipment designed to capture detailed recordings of lectures as a replacement for traditional note taking began to become more common. By 2000, the student to computer ratio at some schools in the US decreased to only 5 students per school computer. As collaborative classroom environments became mainstream, more schools as a whole began to invest in powerful networks and faster Internet connections. By 2010, many school districts implemented or encouraged '1:1 learning programs' which would ensure that all students in grade school would be provided with a personal laptop. Computers have significantly changed traditional teaching methodology into a more 'hands-on' approach, with Forbes predicting that, 'Instead of parking themselves in a lecture hall for hours, students will work in collaborative spaces, where future doctors, lawyers, business leaders, engineers, journalists and artists learn to integrate their different approaches to problem solving and innovate together.' Experience has shown, however, that excessive use of computers can be detrimental to a student's basic academic skills. The Organisation for Economic Co-operation and Development has compared average student literacy, numeracy and science skills in 31 countries (considering three large cities in China separately). It also compared the levels of student computer use in those same countries. The study's conclusion, after correcting for social backgrounds and student demographics, was that moderate use of classroom computers produces the best educational outcomes. The shift in worldwide computer usage and the need for computer skills in today's workforce have pushed the United States government to create guidelines for educators to ensure that students are prepared to meet the demands of the 21st century. The Core Curriculum Content Standards for education are aimed at preparing students with such skills demanded of those entering the 21st century learning environment as well as the 21st century and work environment.