The world faces a number of complex challenges that are sometimes referred to as "wicked problems." Universities have been relatively poor at preparing graduates for such challenges, yet it will be the future professionals who need to tackle the problems. This essay looks at two related projects that have attempted to advance the skills training of graduates for a complex world, in the context of educating engineers and scientists in sustainable development. A Delphi study conducted in the UK suggested that systemic, student-centred approaches were vital to the appropriate development of undergraduates to become engineers with skills in sustainable development. A pilot project sponsored by the UK Royal Academy of Engineering developed an inter-disciplinary course unit, using student-centred principles, to embed the principles of sustainable development, in its broadest sense, in the curricula of engineers and scientists. The essay includes an evaluation of this approach.