"High level wellness...is defined as an integrated method of functioning which is oriented toward maximizing the potential of which the individual is capable. It requires that the individual maintain a continuum of balance and purposeful direction within the environment where he is functioning." Expanding upon this quotation from Halbert L. Dunn, the author of this paper discusses the concept of mental wellness. The literature on the topic is briefly synthesized, and 10 characteristics of the mentally well individual are described: (1) being real; (2) being realistic; (3) being able to satisfy one's needs; (4) being free and responsible; (5) being open to experience; (6) being capable of intimate relationships; (7) being tolerant and accepting of others; (8) being capable of reacting in a wide variety of ways; (9) having "joie de vivre"; and (10) having a positive self concept. (JD)