In this paper I draw on the social intentionality hypothesis to develop an account of cognitive integration. My account sheds light on the variety of cognitive integration that has been of most interest to epistemologists by arguing that it is best understood as the intrapersonal analogue of a paradigmatically interpersonal problem. Furthermore, the intrapersonal version of the problem is solved by simulating the solution to the interpersonal version. Consequently, we better understand the intrapersonal version of the problem relevant to epistemology (...) by considering the interpersonal version. (shrink)