• Mainframes: centralized, expensive, hand fed

• OLTP: Batch mode terminals (enter fields, hit send)

• Minicomputer: Fully-interactive terminals (some graphics)

• PC/Workstation: Local execution, cheap (empowered users)

• Client-Server: Centralization wasn't so bad

• N-Tier: Somewhat decentralized, but really client-cluster

• Web: centralized, cheap, fully automated OLTP

Notes: