PTPT in a Nutshell Apps are silos: If each app could share knowledge with the other apps, the phone would feel like one intelligent companion. PTPT introduces common storage into which each app can feed in and take out data – akin to a wiki that humans use for sharing knowledge. Apps together represent the user’s world An app can serve knowledge from other apps at the right time Cross-App knowledge synthesis leads to new knowledge The phone can support the user based on an understanding of what he will do next contextual. assistive. on-demand.