According to the DSDM principle 'Never Compromise Quality, when should the overall level of quality to be delivered within the solution be agreed?

What DSDM product reflects the approach to the management of the project as a whole and considers, from a management perspective, how the project will be organized and planned?

In what phase is it first established whether further investigation of the project is justified?

During what phase should the strategy for Iterative Development be considered?

How are the business roles critical to the success of a DSDM project?