Organisations that fail to ensure that all contributions – not just those with the loudest voices - are heard, valued and respected are undermining their own performance. They will promote and progress those that they hear and see. Others get left behind. The gender pay gap measures this effect. Gender bias is so ubiquitous that it can be easily measured. But what of the other groups of talent who don’t get heard? How damaging to people and profit is it to allow a culture to persist which measurably fails to recognise and apply its talent?