I agree with many of the posters here in saying that CATs are valuable. I think the instructor has to be careful to ensure that the content matches the delivered material, first and foremost. I think CATs can be applied to subjects related to computer programming. One of the interesting implications here is actually in the environment itself. Most programming is taught in an integrated development environment (IDE) such as Visual Studio. Students come to rely upon aids built into these IDEs, which act like spelling checkers but which straighten out mistakes in your code. Having the student focus on their code in the unfamiliar environment of a CAT might ensure that the student has actually learned the correct syntax and methodology, and aren't just relying upon the IDE.