The Ecological Q-Sort was developed specifically for the measurement of self-concept in older adults. Self-concept is defined as individuals' perceptions of themselves in relationship to their environment. Consequently, self-concept is contextual, multidimensional and varies with the situation. The Ecological Q-Sort was subjected to convergent and discriminant validational procedures in the present study. Correlational analyses provided support for both convergent and discriminant validity, suggesting that this instrument measures ecological, domain specific self-concept in older persons. However, multivariate analysis of variance did not yield significant main effects or interactions for sex, marital status, and health as observed on the sets of ecological and non-ecological self-concept measures.