Create time for the development process and create space to experiment.
In negotiating with the possibility-makers: focus on the question and not the outcomes. Agree on the questions to be investigated. The experimentation phase is in fact research: “interaction research”.
Agree on documenting the journey. This is different from agreeing on intermediate products.
Make it easy to bring in outside expertise along the way. This could be experiential, procedural, or technical-scientific expertise.