Levels of abstraction:
Manager < Projects < Tasks

Manager
Handles context switch of projects
UI Elements
Event handling

Projects
Essentially a namespace of tasks

Tasks
Title + Description + Date

Notifications
Data structure that receive list of notifications to display

Sessionless
Does not save / load state of program between page loads. Next stage will include backend code to read/write to DB or flatfile (in XML). Will require AJAX code.