Mission, Vision & Core Values At St. Joseph’s Nyang’oma TTID, we stand by the following principles. Mission To equip learners with hearing impairment, with technical knowledge, skills and attitude for self-reliance. Vision A global centre for modern technology for learners with emphasis on learners with hearing impairment. Core Values Stewardship. Integrity. Inclusiveness.Professionalism. Innovativeness.Teamwork.