This paper describes a mathematics and technology program for northern Nevada middle school girls. The purpose of the research is to investigate the impact of an intensive, single-sex, out-of-school program on middle school girls' attitudes and perceived abilities in mathematics and technology. To date the program consists of a one-week, residential summer camp with a full-day fall and spring follow-up session. This paper provides a brief background of the present status of females in mathematics and computer science, and discusses research findings on the impact of the program on knowledge and skill, attitudes, performance and participation, personal and social benefits, motivation and effort, and awareness of college and career opinions. (KHR)