Acute Kidney Injury (also known as AKI) is a sudden reduction in kidney function. It is not a physical injury to the kidney and usually occurs without symptoms. It is very common - in England over half a million people sustain AKI every year. As well as being common, AKI is harmful to patients and sometimes can be preventable. Tackling AKI is a quality improvement project, funded by the Health Foundation, which has been set up to test a potential solution to address these problems. We want to improve the quality of care that patients receive when AKI happens. By doing so, we hope to improve the number of patients who recover from AKI.