James Dyson is also known for his trial-and-error approach in building function-led product designs.

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Such a trial-and-error approach is expensive and costs lives, because several diseases, such as Alzheimer's, are best treated as soon as they are diagnosed.

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"The common approach of change through trial and error is actually riskier than parallel attacks, " he argues.

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Callaway argued that the KPMG approach was needed only if it had committed an error in setting up the fund--and that a change in return estimates wasn't an error.

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But their approach play remained predictable and Cech, eager to make amends for his error, was never seriously threatened again.

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Ryanair said in a statement it was due to an "error by the Eirjet pilot who mistakenly believed he was on a visual approach to City of Derry airport".

BBC: The plane landed at an Army base six miles away