Activity 1,2 - Both Waterfall (Predictive) and Agile(Adaptive) methodologies

Activity 1: 

Both Waterfall (Predictive) and Agile(Adaptive) methodologies are built based upon core tenets.  Describe one core tenet for Waterfall and one core tenet for an Agile methodology of your choice and explain why you feel it is necessary for the methodology.  

Activity 2: 

Case Study Overview:

In conventional business and government megaprojects--such as hydroelectric dams, chemical-processing plants, or big-bang enterprise-resource-planning systems--the standard approach is to build something monolithic and customized. Such projects must be 100% complete before they can deliver benefits: Even when it's 95% complete, a nuclear reactor is of no use. On the basis of 30 years of research and consulting on megaprojects, the author has found two factors that play a critical role in determining success or failure: replicable modularity in design and speed in iteration. The article examines those factors by looking at well-known megaprojects, both successful ones, and cautionary tales.