Errorless Learning is an instructional strategy that insures high levels of correct responding. This prevents any chance for incorrect responses and thus decreases the "learning" of errors. Read here for details.
For children with autism, some social situations can be particularly difficult. However, preparing them ahead of time and teaching/rehearsing interaction strategies can make the process a bit easier.
Many children experience strong negative reactions to smells that surround them. A number of strategies may help such children to cope and handle these settings.