Installing child restraints can frustrate even the most capable of parents. A system called Lower Anchors and Tethers for Children is supposed to make things easier by standardizing attachment hardware, but a new study conducted jointly by UMTRI and the Insurance Institute for Highway Safety (IIHS) shows that many automakers aren't paying attention to the key factors that make LATCH work. Only 21 of the 98 top-selling 2010-11 model passenger vehicles evaluated have LATCH designs that are easy to use.