The purpose of the present work was to identify general problem solving skills that underlie the production of insight. One hundred and eighteen participants completed insight problems, analogies, series-completion problems and the Remote Associates Test. Scores on all measures were related to performance on the insight problems (Pearson r's ranged from .31 to .47, p < .008). These findings are consistent with the notion that the abilities to apprehend relations and fluency of thought are involved in insightful problem solving.An insightful solution is one that is both non-obvious and functional (Dominowski, 1995;Sternberg and Lubart, 1996). Insight occurs when a solver restructures a previously intractable problem such that a new understanding of what needs to be done appears in consciousness. Restructuring changes the problem situation "from an unclear, inadequate relation, to a clear, transparent, direct confrontation--straight from the heart of the thinker to the heart of his object, of his problem" (Wertheimer, 1959, p. 236). What are the cognitive processes that underlie the ability to perform such a Weisberg and Alba, 1981) alike have been interested in defining the processes that give rise to insight. The purpose of the present work was to use an individual differences approach to help disentangle the cognitive processes that underlie the production of insight.The individual differences approach has not been used often in the context of understanding insight. However, Jacobs and Dominowski (1981) found that performance across different object-use insight problems (e.g., the Candle-Box problem) was correlated. Further, Schooler and Melcher (1995) reported the findings from an unpublished study in which they identified perceptual restructuring and ability to break context as predictive of performance on insight problems and not on non-insight problems. Schooler and Melcher argued that because these two skills uniquely predicted insightful problem solving, they are representative of the distinct cognitive processing that is involved in producing insight. Whereas Schooler and Melcher focused on identifying what it is that distinguishes insightful problem solving from other types of problem solving, the present work focused on determining which general thinking skills underlie insightful problem solving. Greeno (1978) provided the theoretical framework for the present study. He argued