Computers can help the range of ways learners build up their own perception. Students who collect data from the Internet can be self-directed and independent. They can select sources to study and the connections to follow. Relying on the bounds laid down by teachers, the students may be in full control of their subjects and their studies. Students can take a computer-based activity at their own pace. Instead of scores of students working together on one activity, technology helps independent execution of work. Those who start to fail to keep up can get an instructor's individualized assistance while others can start to deal with more difficult tasks. Computer software can combine text, pictures, sound, and motion to offer various choices for students. Multimedia software will not be the only classroom resource, but it can contribute richness and variety to student work. Students can build on their own understanding by using computers as resource tools, as workstations for individual learning, or as communication means to share their thoughts with other students. Individual perception and experiences must be shared and evaluated to program content. By recognizing students' individual perceptions, teachers can find out the impact of students' past understanding and promote their education through new skill. Computers can be utilized to help active events collecting information and resources, discussing with colleagues, struggling through a challenging problem or application--or they can help in deliberation. For instance, despite the fact that an on-line discussion through electronic mail is an active event, such discussions generally induce deliberations. They assist us to think about thoughts and to check the understanding. In another thoughtful application, teachers can use computers as tools for making students' journals which are outstanding medium for reflective examination of events.