Its not Excellence or Diversity.

"CIA analysts were individually perceptive but collectively blind. They all came from the same background, so shared the same blind spots. How many powerful groups share this pattern? Cabinets, boards at some tech firms, senior civil servants…

...We need diversity of THOUGHT. When people with different perspectives combine, there is a vast uplift in collective intelligence. Yet we are drawn to people who think alike. We feel smarter when people mirror our beliefs and assumptions. This can be disastrous...

...Constructing diverse thinking teams leads to excellence - that can solve complex problems"

Matthew Syed