One of my customers describes using my 'vision-led' approach with a group in central Europe as just so powerful.
The group were transforming a development process that currently takes two months to complete.
Once he established the total value-adding time in the end-to-end process, he challenged them to complete it in 5 days, which they thought was ridiculously short.
However, by taking them through my approach, including creating a "blue-sky" vision, the group eventually agreed a practical vision for the process of just 2 days.
A great result, and the group are now enthusiastically implementing their new solution.