The Hammerstein-Equord rule: two by twos

I have long been a sucker for two-by-two matrices.

I suspect the first I came across was the Boston Consulting Group matrix:

One of my favourites, and one which I have used in my professional work, was Donald Rumsfeld's known/unknowns, for which he was ridiculed at the time: I think the ridicule was entirely misplaced.

The latest I have come across was from this recent letter in the Financial Times: I converted the officer's classification into a two by two. I suspect, from my own experiences, that there is some truth in his views: for instance, the very highest echelons in business are typically taken by good delegators, aka 'lazy' people.

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