Evaluation has not been yet presented as an independent issue in genera] psychology despite of a significant role of assessment processes in the holistic psychic functioning of man, and despite of a wide introduction of evaluation phenomena in various spheres of human and social activity, and regardless of the great interest for studying evaluation in a number of psychological disciplines. The article gives an analysis of the essence of evaluation as a specific psychic phenomenon, and a detailed account of two basic classes of evaluation as well as proposes working definitions of assessment and evaluation.