As I work as a midday assistant I work out on the playground at lunch times, I have had a child who had fallen over and grazed their knee, I took them into the classroom where we do first aid. I cleaned their knee and applied a plaster if I felt it was needed. (making sure that are allowed to wear plasters and are not allergic to them) I then documented the accident down on the forms that the school provides, as this accident was just a grazed knee a letter to the parents was not needed but the teacher at the end of the day would inform the parents.