presentation （5） Then the next design method we used is Prototype, at first we made some models by paper. We made every characters and elements which should be presented in the sorting process by hands. They are rough but easy to change positions and add details, as we wanted to make a video to record the sorting system in a robort’s view, we changed these characters’ position, changed the size of this scene, changed the angle of camera, changed the shape and color of some characters. We made a video each time we made any change, we record them and analyze each video even shared some videos to random people and asked them whether they can understand what we tried to present and found out which is the most confused part of each video, then we made process. At the meantime, I also made 3D models and rendering more than 300 images, another group member made a video with these pictures. We presented these two different style videos (one is made by paper models, the other is made by 3D software) to ual students, and found that over 90% of them prefer 3D models because characters in this video are more adorable and some of them also think presenting sorting system by using lovely music and cartoon characters are really attractive and interesting. So this is my research process, The design process is very flexible, choose which method, when and how to use it, all depends on us, it isn’t too stict.