Participants in design processes make an effort to come up with solutions that will be deemed acceptable, while accomplishing to ‘think out of the box’. Thinking ‘outside the box’ is often announced as a challenge to and for design teams. ‘The box’ is a metaphor often used in creative processes, and in organisational practices, as a term for rules and regulations, everyday routines and tacit knowledge of ‘how things usually are’ and ‘what we know about the world’. Such a challenge is meant to encourage participants to approach a situation with an open mind, challenge the most basic assumptions and be willing to do things differently. Basically, something different is being called for. Studies have shown that it is striking, how much the participants orient to actually ‘fit’ the box, even when asked to develop it. This paper shows how participants in design processes are ‘sizing up the box’, while participating in meetings or workshops in order to develop a design. They identify key stakeholders of the designated design project; they share their own expectations of these key stakeholders’ possible perceptions, discuss the success criteria and negotiate the values that are to
govern the design team in the development process.