An essential memory function in our daily lives involves remembering to perform intended actions when there is a delay between the point of forming the intention and the opportunity to carry out the intended action. This "remembering to remember" is called prospective memory. This issue highlights the current breadth and depth of research questions and approaches in this area. The reported studies explore applied questions, methodological and analytic issues, and the effects of working memory, personality, and age-related differences in childhood and adulthood, and include an investigation of the underpinning of prospective memory in non-human primates.