In his Afterword, Engelbart reflects on the progress made since he first envisaged interactive software tools to augment human intellectual work in the 1950s and 60s. His historic 1962 report used interactive argument construction and analysis as a prime scenario to illustrate the potential of such tools. Engelbart outlines his continuing mission to build infrastructures to assist communities to improve the way they work, in order to better tackle the complex, urgent problems facing humanity. He concludes that computer-supported collaborative argumentation is a key element in this infastructure, and poses a number of questions that define an agenda for the future convergence of Computer-Supported Argument Visualization with his goal of "augmenting human intellect."