Allenby suggests the implications of technology systems may be understood using this simple three-tiered model: O Level 1 basic (or primary) impact; Level 2 outcomes, Level 3 projections O Level 1 technological impacts, Level 2 techno-social implications: Level 3 sustainability impacts O Level 1 results-oriented; Level 2 impacts-oriented; Level 3 cultural extensions O Level 1 immediate impact; Level 2 networked implications: Level 3 earth systems implications
