The challenge is to manage creative people so that the output is fruitful. The challenge is not to have an open environment and simply let them do whatever they want.
You would not let your kids do whatever they want. So the challenge is to create accountability in a non-mechanistic way. You cannot come in with a clipboard and check off boxes and figure out why something has not been done on schedule.
If you are at Coca-Cola, the creative challenge is one of maintaining - rather than creating - a tremendous level of consumption for your products.
If you come up with a new product, you can very easily track its contribution to the bottom line. But often the challenge can be both large and subtle.
Rather than managing by clarifying events, the creative process may require raising the level of uncertainty. Sometimes this can be done by issuing a creative challenge that has resonance in that it inspires the team to activity.