In 'The New Rational Manager', Charles Kepner and Benjamin Tregoe, outline their approach to solving problems.

Their framework targets the gap - deviation - between expected and actual outcomes.

The process asks what, if anything, is distinctive about the 'is' from the 'is not' for various parameters.

Since people tend to think 'what is' rather than 'what is not', the Kepner Tregoe approach addresses the 'what is not' deficiency.

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