Another framework:

• Geology – Platetechnonics, Erosion, etc.
• Nature – Evolution, etc.
• Culture – Languages, etc.
• Goverments
• Markets
• Firms
• Fads

Somethings change faster than others. Which makes for interesting interface design problems.

The old bay bridge floats on 60 foot pillings in a slurry of mud; which means it would probably collapse in an earthquake. The new version will have 300 foot pilings that reach bedrock. How do people reach the consensus to do a project like this? How deep can a firm’s pillings go?