"After thinking about this problem for a number of years, I've decided that the central technical issues here are: adaptive modeling, especially activity discovery (as distinct from activity recognition); and scalable interaction, including coordination and influence. Further, I have come to believe that as a practical matter, it is necessary to build development environments that support rapid development, and so I try to think seriously about authorial tools, including adaptive programming languages, domain-specific example-driven development, socially-guided machine learning, and corresponding issues in software engineering."