CLP focuses on software tools for classroom use that helps students construct an integrated understanding of science. Now having completed its fourth incarnation, the CLP software has proved to be a powerful tool in middle school science instruction. The most recent program, which uses Macintosh Hypercard software, allows the user to predict and respond to real-world experiments on-line. For instance, the student is given a scenario such as the following: If you hold two poles of equal length into a fire, one made of wood and one made of metal, which will burn your hand faster? As the student settles on a response, she types in the answer into an on-line notepad, cutting and pasting pertinent phrases from an on-screen databank. The computer then assesses the student's response as knowledgeable or not.