The paper has a negative and a positive side. The negative side argues that neither the classical notions of narrow nor wide content are suitable for the purposes of psychological explanation. The positive side shows how to characterize an alternative notion of content (ecological content) that meets those requirements. This account is supported by (a) a way of conceptualizing computation that is constitutively dependent upon properties external to the system and (b) some empirical research in developmental psychology. My main contention is that an adequate computational explanation of the behavior involved in cognitive activities should invoke a concept of content that can capture the intimate dynamical relationship between the in...