The document discusses how computers can be used as tools by teachers based on constructivist and social constructivist learning theories. It describes how computers can act as informative tools by providing vast amounts of information from the internet. Computers can also be communication tools through videoconferencing and discussion forums. They allow students to construct knowledge by manipulating information and organizing ideas. Computers further enable co-constructive learning through shared documents and note-taking. Finally, computers can situate students in virtual environments for simulated learning experiences.