Monthly Archives: May 2019

Risk-based thinking – it’s risky not to understand the mathematics of risk (and randomness)

Dr Melvyn Langford explains how the US Department of Defense (DoD) invented the 5×5 risk matrix in the 1980s. The methodology uses ordinal numbers (which are only for ranking) as if they are suitable for calculations.  It is misleading, meaningless and … Continue reading

Posted in History, Laboratory medicine, Management, NHS, Practical problems, Science | Tagged , , , , | Leave a comment