Independence is the goal of education. When you see a child hard at work on a project that he is doing on his own, stop before you interrupt his independence to correct. Is it something that can be corrected after or can be accepted as a different way to look at the project? Sometimes we grab pencils, pens, and scissors too quickly when just a quick direction would work.
don't stop him to write. Let him create ideas. Don't snatch a child's independence n his little happiness. Don't impose him to work according to your will. Let him make choices of his own. Overshadowed is always bad and harmful for a child's personality and future.
your interruptions can spoil the abilities of a child so just think about it.