This study offers field estimates of the factor validity and internal consistency reliability of the Self-Esteem Index (SEI) using SEI data from 208 regular and special education students in grades 3, 4, and 5. Exploratory factor analytic results support the existence of four factors as anticipated; however, various inconsistencies are noted between the anticipated and actual factors with which particular items are associated. Likewise, confirmatory LISREL results indicate a somewhat poor fit of the data to the expected factor model. Alpha reliability results are somewhat more promising, with coefficients for the entire scale and the four anticipated subscales exceeding 0.80. Based on the findings, cautions are offered regarding use of the instrument in educational settings. Two tables are included. (Contains 22 references.) (Author/SLD)