From Data to Knowledge and Beyond

Joining Dots has a good entry on the familiar question of "what is knowledge."  JD also adds "cleverness" to the mixture of data, information, knowledge and wisdom.  From Data to Knowledge and Beyond...

There has always been plenty of disagreement about what defines data, information and knowledge. If you are using these words when defining system requirements, it can be beneficial to calibrate your definitions with potential suppliers, partners and customers.