Here’s a cartoon I created. It involves several Fair Information Practice Principles (FIPPs) and privacy best practices. The ones involved (and not heeded) in this cartoon are doing a data inventory, informing people about the purposes of the collection of their data, using data for only those purposes, and not keeping data longer than necessary to accomplish those purposes.
For many organizations, there is a lot of data collected that gets stored and forgotten, or that is collected with no apparent purpose in mind. Data inventories are a great way to take stock of this data and determine whether it is really necessary and appropriate to keep it.