![](/faces/javax.faces.resource/images/design/ntier.png;jsessionid=1fa53b5c4c039288f49da5b50b95?ln=microneering)
In the early 1990's, Microneering designed and installed production systems with three tiers.
- Presentation
- Logic
- Data (installation of department Oracle database on shop floor)
Needless to say, at that time shop floor never got computers ( that was for email and managers only).
This installation supported both Electronic Work Instructions and collection of many shop floor data points,
such as hours worked, etc. And a database for the production area was unthinkable.