Mythosynthesis is a mode of growth and development therapy using personal and social frame of reference we call a myth, and the mythic envelope through which here and now experience is filtered is the mythosphere. All human beings exist within their own mythosphere. When the mythosphere is based on inadequate or distorted external information it becomes a limiting and inadequate system for dealing with the here and now. Mythosynthesis helps individuals update their mythospheres, improving the ability to function. (9 pp.)