We have summarized some of the guidelines and a few of the common precautions which have governed the behavior of the experimenters whose work is cited in the following chapters. Their standards probably are the best basic against which the student may judge his own work. This emphasizing of precautions should not lead the student to conclude that all the fun has gone out of experimental psychology or that one must be an experienced researcher to make a contribution to the field. Far from it! Probably in no other laboratory science are so many undergraduates participating in, and making significant contributions to, the experimental literature. As you study the following chapters, jot down on the back page of your notebook the ideas that come to you for experiments that many fill gaps in our knowledge, or help us evaluate an hypothesis. Don’t be too self-critical at this stage of the process; do include the page number so later you can reread the material and see how your idea sounds; if you don’t jot down a few key phrases and a page number when the idea strikes you, it may be lost forever! Discussion with your colleagues and instructors will help you sharpen your judgments; some of your ideas may be developed into your own research problem. There is plenty of room in experimental psychology for fresh viewpoints, bright ideas, and clever experimentation.