This paper discusses cognitive and noncognitive variables, and their relationship with each other, in learning and in educational evaluation. The nature of noncognitive learning environment variables is examined. The following instruments that have been widely used in assessing classroom environment are described: (1) the Learning Environment Inventory (LEI); (2) the Classroom Environment Scale; and (3) My Class Inventory. The description lists the instruments, the levels at which these instruments have been and can be used, the number of items in each scale, and the classification of the scales. A model for assessing the validity of the instruments is developed. The psychometric adequacy and the construct validity of the LEI is examined in the context of cognitive and noncognitive variables. It argues that the use and the interpretation of the instruments should be considered in conjunction with contextual constraints such as demographic variables, motivation for use, the individual and group styles for responding, and experience with the instrument. (JAZ)