The study objective was to apply the Total Giftedness Development Model (TGDM) among a Saudi Arabian sample and study its effectiveness. The descriptive and case study research methods were applied on a sample of 807 male students, age 5 to 18 to test the efficacy of the model. Several instruments, including The Saudi Mental Abilities Test, Torrance Test for Creative Thinking, academic achievement scores, and Renzulli's Scales for Rating Behavioral Characteristics of Superior Students (SRBCSS) were used in the study. The most significant results of the study are: (a) The TGDM effectively influences the increase of mental abilities of participating students. (b) The model significantly affects the creative abilities of participating students. (c) The model significantly affects the academic capabilities of participating students. (Contains 12 tables and 1 chart.)