There are just three parts to this kids knockdown stool, so it is easy to build and assemble. This one was build using scrap plywood and you can find the free templates and instructions at the link.
This stool is neat, and as a bonus it can be taken apart for easy storage. Follow along at the link (there is a video too) and build this three piece knock down stool. The tenons showing through the top is the best part.