An asset class must pass all three tests to be included in a portfolio.

FORBES: How to Pick Asset Classes

Alternatively, their teachers can submit results from national curriculum tests, while the children compile a portfolio to demonstrate their all-round creative and intellectual skills.

BBC: Bringing on the brightest

Nothing tests the mettle of a value investor like watching a large portfolio holding slowly and steadily melt down.

FORBES: Two Celebrated Investors Want To Fix Their Funds--And Chesapeake Energy