In setting up a controlled experiment, many decisions must be made. For example, which seeds will you use for the experimental and which seeds for the control planter? You will take all of the seeds from the same package, of course. Of course? There, you see, is an important decision. You want the seeds to be as much alike as you can get them—as alike in inherited traits as possible. As you pick the seeds you should be careful to choose uniform, sound seeds (e.g., not broken, undersized, or discolored). See appendix A for instructions on how to do a seed germination test to make sure the seeds you have are viable.