in the rows, 6 parameters are considered:

• recognition word/minunte
• style
• hardware
• vocabulary
• training
• price

in the columns, for each of them, the data in 3 periods are reported:

• 10 years ago
• 5 years ago
• today

The data in the table are the following:

• recognition word/min
  • 10 years ago: more than 20
  • 5 years ago: more than 60
  • today: more than 160

• style
  • 10 years ago: disjointed
  • 5 years ago: continuous
  • today: continuous

• hardware
  • 10 years ago: special
  • 5 years ago: special
  • today: standard

• vocabulary
  • 10 years ago: more than 5000, finite
  • 5 years ago: more than 10000 extensible
  • today: more than 300000 (active), more than 750000 (passive), extensible

• training
  • 10 years ago: more than 1 hour
  • 5 years ago: more than 30 minutes
  • today: less than 10 minutes

• price (Euro):
  • 10 years ago: approximately 3000
  • 5 years ago: less than 1000
  • today: less than 15