Enrichment is a well accepted method of satisfying the needs of talented students in our schools. One recent addition to the enrichment material available in Australia is the Maths Challenge, produced by the Australian Mathematics Trust. The Challenge is nationally accredited through the Australian Mathematics Trust and the University of Canberra, and full statistical evaluation is sent to participating schools at the end of each program. This study sets out to assess the efficacy of the Maths Challenge. The Gauss Series was used with a 'top set' Year 9 class at an all boy private school in Perth. Fourteen students, (the experimental group) volunteered to take part in the Gauss Series (the enrichment program). The other fifteen students in the class became the control group for the experiment. There was no difference in the treatment received by the experimental and control groups except participation in the Maths. Challenge. The study used quantitative and qualitative measures to assess the effectiveness of the enrichment program. The quantitative measure was of performance on selections of problems taken from earlier Australian Mathematics Competition papers at regular intervals in a repeated measures design. The qualitative assessment used a questionnaire to determine attitudes to problem solving administered to both groups at the beginning and again at the end of the program, and a series of classroom interviews of a randomly selected sample. Students were encouraged to participate, to question, and to give their own methods of solution of problems to the group and to explain them to others. Quantitative results showed that the experimental group improved its performances on the AMC papers, the measure of problem solving ability, compared with the control group. Qualitative results were inconclusive, with little evidence from the attitude questionnaire or from the interviews of any change in attitude to problem solving as a result of the enrichment program. As a general conclusion it seems that the Maths Challenge is an effective program in improving performance in problem solving, although there was no evidence of any change in attitude to problem solving as a result of the program.