McGrath showed the effectiveness of systematic desensitisation by studying a 9 year old girl Lucy who was afraid of loud noises like party poppers. She was taught to imagine being in home in her bed with her toys and given a "fear thermometer" to rate her fear from 1-10. She was presented with a loud noise and told to use her calming strategies. By the 10th session Lucy had reduced her fear rating of party poppers from 9/10 to 3/10.