Assembly is simple. After assembly, I noticed that the back cushion dangles, when you try to tighten it a little, the inner plastic part completely fell apart and crumbled. Not just cracked, but fell out in pieces. This is a child seat . . Of course, the child will put it under increased stress. How can you make a fastener so flimsy. I didn’t return it, realizing that, in fact, it was my own fault, but I couldn’t fix the back in another way, tightened it a little more and everything fell apart.