The way that activity, tasks, notes, etc information is shown on the right-hand side of the contact page is inefficient and could easily improve by simply adding an "ALL" section as the default view state, which would show all items of all types associated to that contact (notes, tasks, appointments, etc), in chronological order. The current tabs could remain and would simply become "filters" to show ONLY that type of data.
This default view would give us a clear High-level picture of all interactions and activity for that contact at a glance - which is especially useful when we receive and incoming call and need to quickly acclimate and drive value-added conversation.
Please consider this modified approach!