When a student has finished working on one project, he should keep all the research material in a safe place. Students may think that once the project is completed, the research material has no use. This is not true. One can never know when the material will be needed again. The student may not need it again, but his friends might. He can save someone else from the problem of searching for the material from scratch. The data that the student has collected has been done in a painstaking manner. That is why it should be preserved for posterity so that it can be of use in the future.