Preventative Action

I'd like some help in better understanding the Preventative action type.
What is unique to a Preventative action that is different from Remediative or Mitigative? I recognize that there is some overlap, however it would be great to have 1 example to demonstrate the uniqueness of Preventative that would qualify it as needing its own action type.
In order to try and get my head around this, I did a quick matrix of the current examples and mapped them to each action type. What I'm not seeing is a use case where Preventative would not have already been categorized as either mitigative or preventative.
Does anyone have a good and unique example for Preventative?
Known Threat  Blocking Rules  Affect Policies  Blackhole  Sinkhole  Blacklist  Patch
Investigative  Maybe  N  N  N  N  N  N
Mitigative  Y  Y  Y  Y  Y  Y  Y
Remediative  Y  Y  Y
Y
Preventative  Y  Y  Y  Y  Y  Y  Y
Thanks  -A

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Andrew Storms
VP of Security Services
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707-477-4335