Need a better explanation of security models

Hey everyone, studying for my 24 June cissp test. One weakness I have is a inability to flat out memorize the security models, Biba, Brewer Nash, Bell LaPadula, Clark Wilson and what they all do, their permissions etc. I can read them 10 times and still wont remember.

Does anyone have a good explanation anywhere, I have many, but they are all incomprehensible. Meaning, if you were to teach a 6th grader [my standard for knowing something if your going to teach it] on these models, what would you show them.

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