In this study, the researchers explored whether different types of people who gamble respond to a responsible gambling (RG) program in different ways. The researchers reviewed data that were collected in a previous study. Some participants received a telephone call about their gambling behaviour and possible strategies to make changes. Other participants received a letter about their gambling behaviour and possible strategies. The researchers identified six different types of gamblers. In general, the telephone call was more effective at encouraging participants to spend less money on gambling than the letter. The letter worked as well as the telephone call for gamblers who spent a lot on lottery. Thus, the letter seemed more cost-effective for lottery gamblers.