As a data architect, very few things bug me more than isolated islands of data.
In technical terms these disconnected data stores are called information silos or data silos (wikipedia), after the grain silos you see driving across Illinois. While they look peaceful and picturesque in heartland, and it's dirt simple to start entering data in a spreadsheet, in the long-term it's far more difficult to harvest data from a data silo than to grow corn in the back fourty.
Data Silos cause multiple problems for an organization:
If the data silo isn't easily available to the staff person needing the data, then it's only human nature to improvise. They guess at the data, spend time searching, find an incorrect copy of the data, or just give up and skip the data to meet the deadline. Or, without a clear central data source, when new data is created within an organization, the culture may be to create another spreadsheet.
The end result can be:
And that's the reason behind this statement in the Tejon Tech's Culture Statements:
Kill the Silos!
As a consultant always keep your eye out for unnecessary data silos, because there's value in killing silos.