The relationship of Locus of Control and Sensation Seeking to 267 high school students' perceptions of their Actual and Ideal socio-psychological climates as measured by the Learning Environment Inventory (LEI) was investigated. A principal components analysis of the LEI responses yielded three substantive dimensions: pleasantness index, relationship index, personal development index. Separate analysis of variance of the scores on the three components yielded significant Instruction and Locus of Control effects on the pleasantness index. No other significant effects were found. Results were discussed in terms of the structure of the perceived environment and the relevance of individual difference measures for socio-psychological climates. (Author)