The document discusses how computers can be used as a teacher's tool based on constructivist and social constructivist learning theories. It explains that constructivism views knowledge as constructed by individuals, while social constructivism sees it as constructed within a social context through exchange of ideas. The computer can act as an informative tool by providing vast information resources. It can also be a constructive tool by allowing students to manipulate information and build new knowledge. Further, computers enable co-constructive learning by facilitating collaboration through tools like shared documents.