The design team takes collective responsibility for setting up the engagement to be successful and should bring a representative voice across the range of perspectives involved in the engagement itself. Think of this as the voice of customers, stakeholders, decision-makers or any other key dimension of your target audience, by having this voice in the design process we increase the richness of consideration which will ultimately drive better engagement.
On multiple occasions we’ve found that bringing together the right group for the design has actually negated the requirement to hold the engagement at all – we’ve solved the problem or defined the path through the design process itself.