This resource contains the following Space Elevator, Building a Space Elevator, “Realistic” Space Elevator, Why a Space Elevator?, Summer Project, Functionality, Our First MDD, A Little More Detail, Our Second MDD, Viewer Functionality, Class Hierarchy for Viewer, Multiple Views, Simple Example of Multiple Observers, Multiple Observers, Observer Design Pattern, java.beans Support, PropertyChangeSupport Class Methods, Pictorially, Usage, Demonstration.