A big problem that we often see out in the field is that we humans have a tendency to make a lot of assumptions.
Assumptions stem in our imagination and our willingness to accept something as true without question or proof.
This can be problematic for a variety of reasons. In work teams, they can primarily grow a feeling of unfairness, undermine mutual trust and turn fantasy into unnecessary conflict.
This useful guide from Strategyzer provides some concrete, non-confrontational techniques for getting people to review their assumptions. This will be particularly relevant for practitioners conducting stakeholder sessions in the beginning stages of the N2D Method.