Involving both motor and critical-thinking skills, it's not surprising that learning to write is a process that takes years to complete. It also happens in order, with each skill building on the last.All children start writing by scribbling, an activity most toddlers enjoy. To do it, they must use coordination to hold the crayon, keep the paper still, and apply enough pressure to make a mark on the paper.Even as we move to a society driven by keyboards, kids still need to learn to write by hand.