Abstract
I argue that STS education for engineers, despite its prima facie usefulness in demystifying the conventional image of science and technology, should deal with a few challenges in order to cultivate 'responsible' engineers. The challenges come from the fact that there are more than one legitimate way of understanding 'responsible' in the engineering contexts depending on how wide the range of responsibility is intended and on how the relevant reference class is defined. In order to tackle these issues, I suggest that we should take into account more seriously the 'value-laden' nature of the engineering design.