Social Story "No hitting" has been tried and tested with my students.Social stories help a person with autism understand how to behave or respond in a particular situation using a visual guide describing various social interactions, situations, behaviours, skills or concepts.
Free, printable "folder stories." Simple one page social stories that teach appropriate social skills and behavior. Great for your students with special learning needs, especially autism. Download these FREEBIES at: http://www.filefolderheaven.com/autism-tasks/folder-stories