Mainframe batch processing to personal tablet computing.
Nearer in time and location to the event that data is collected the more useful it becomes.
Discreet circuitry with limited storage to high-volume integrated circuit storage.
Magnetic tape to 5 inch portable hard disks to USB powered hard drives. Rigid hard drive systems to Winchester disk systems to semiconductor drives
Barrel to dot-matrix to inkjet to laser
Assembler language to Cobol to spreadsheets to datanases to very high level languages
Mainframe operating systems to Unix/Linux to Windows/Mac to Android and networking
Analogue to digital transmission systems.
Electro-mechanical exchanges and switching systems to STD to international STD to digital switching systems.
End to end links to packet transmission to broadband