Defining design principles at EMBL | Journal | The Personal Disquiet of Mark Boulton
Mark describes the process he favours for creating (discovering?) design principles, like the ones for EMBL (I must remember to add those to the collection).
All you do is be mindful of when the team repeats design desires. This could be several members of the team say the same thing in a slightly different way, or that you keep circling around and around a problem but struggle to articulate it. By being mindful at all times to this a team can quickly pull together principles that are derived from doing the work on their particular problem rather than principles which are imposed on the work. An important difference.