Why does Charlie Munger believe it is so important to have multiple models in your head? How might the use of multiple models be used as a corrective measure for the sometimes inappropriate use of the judgmental heuristics described in Tversky and Kahneman?

Why does Charlie Munger believe it is so important to have multiple models in your head?  How might the use of multiple models be used as a corrective measure for the sometimes inappropriate use of the judgmental heuristics described in Tversky and Kahneman?