Delivering resilience will require innovative systems-thinking skills of practical wisdom that go beyond technique. Aristotle's notion of phronesis as practical wisdom, which was largely lost until contemporary thinking about virtue ethics, provides a basis for a modern interpretation. Resilience, risk, vulnerability, robustness and sustainability need to be set not just in the dominant paradigm of scientific/technical rationality but also within a reflective practice that nurtures practical wisdom and questions 'why' before 'how'. Practical rigour, as part of practical wisdom, is the meeting of a need by setting clear objectives involving many values (some in 'wicked' conflict) and reaching those objectives in a demonstrably justifiable way. Seven elements in practical rigour are described. Two keys to delivering resilience are: (a) to allow professionals to publicly admit that we do notknow when we genuinely do notknow; (b) to integrate people, purpose and (old) process through collective practical wisdom emerging from collaboration and learning together.