The Myers-Briggs Type Indicator is a Jungian-oriented, self-report inventory. Each of its four scales provides categorical type classifications as well as continuous scores. The intercorrelations and reliability of the scales, in terms of both measures, were determined for high school and college samples. The Extraversion-Introversion, Sensation-Intuition, and Thinking-Feeling scales were independent of each other, but the Judging-Perceiving scale was moderately related to the Sensation-Intuition and Thinking-Feeling scales. The internal-consistency reliability of the continuous scores was generally in the .70's and low .80's and the type categories' reliability (using a lower-bond estimate) was generally in the .40's and .50's.