One of the driving principles behind my client-management style is to avoid surprising the client.  This is really just a proxy for constant and consistent updating clients on their status, enrolling them in the process of being engaged with their own account.  Whether it’s forecasting creative direction before a first draft, or advising that a late-breaking change has cost implications, in my experience clients react positively to being told in advance what they are about to see.  This is a time-consuming process but ultimately saves both time and trouble for all.