There are many good reasons to want social policy to be based, where possible, on numerical evidence and indicators. If the data clearly shows that placing babies on their back reduces the risk of cot death, this information should guide the advice which midwives give to new parents. On the other hand, not everything that matters can be measured, and not everything that can be measured matters. The care a midwife offers may be better or worse in ways that cannot be captured by statistical indicators. Furthermore, even when we are measuring something that matters, numbers require interpretation and explanation before they can be used to guide action. It is important to know if neo-natal mortality rates are rising or falling, but the proper interpretation of this data may require subtle analysis. To make matters worse, many actors aren't interested in proper interpretation, but in using the numbers to achieve some other end; as a stick with which to beat the midwifery profession, say.