The assembly instructions are TERRIBLE! They read as if an illiterate had first written them in Japanese, translated them into Chinese, and then written them by a Chinese who has never seen the model translated into English. Photos don't help. The problem isn't that I don't know where the organs belong, but that they fit together like a three-dimensional puzzle and require precise arrangement and placement to fit into place. I gave it to a smart 8 year old who is interested in anatomy and he couldn't put it back together. And also for his mother who is PA. The model is well made and the design and placement of the organ is first class. Almost indestructible. Good tutorial if it wasn't so hard to put back together.