This study investigates (1) the relationship of two potentially valuable measures of sequential processing to each other and to a measure of digit span, and (2) the relationships among tests of sequential processing and other measures of cognitive functioning. Subjects were 188 first grade students who had been screened in kindergarten for risk of later learning disabilities. Fifty-nine children had been tested with SEARCH (Silver & Hagan, 1976) and 62 had been tested with the McCarthy Screening Test (MST). After school opened, a game called Electric Simon was administered individually to each child and a film test called Serial Integration was administered to class size groups. Performance on the Electric Simon game correlated significantly with a digit span measure -- the Numerical Memory sub-test of the MST. Simon scores also correlated highly with the total SEARCH score. Film test performance was not correlated at a significant level with the Numerical Memory sub-test. SEARCH Rote Sequencing sub-test scores correlated more highly with the game than with the film. Further, the Simon game exhibited significant correlations with all but one of the SEARCH sub-tests and a consistent pattern of low but significant correlations was found between the Simon game and most of the MST sub-tests. Electronic Simon is thought to be a useful tool for research of sequential processing ability. (Author/RH)