Nurses, midwives and nursing students are legally responsible for their actions. This article discusses the legal standard of care required in relation to nursing and midwifery practice and nurses’ professional standards and code of conduct. It examines how courts in the UK determine if nurses have met their duty of care and how nurses must ensure they maintain competence to provide safe care. It examines why organisational knowing – understanding the organisation in which one is employed; its people, values and how it works – is important for all nurses, regardless of their level in the organisation. It also discusses workplace incivility and its adverse effects on nurses, patient care and healthcare organisations. The article explains that if nurses are uncertain why they are doing something, they should investigate this further, because the law expects nurses to be able to justify their actions, or failure to act.