This is an interesting topic to discuss. What are the pros/cons of each approach? In what circumstance does the preference change? Etc... too bad that this anal

This is an interesting topic to discuss. What are the pros/cons of each approach? In what circumstance does the preference change? Etc... too bad that this analysis is left as an exercise to the reader. In my experience phased migrations are never completed. Also some people often become unhappy about the order of steps taken. Some will wish a faster migration, others want to push it as far as possible into the future, and in the meantime you have lots of arguments, which parts still need maintenance. So I prefer the pilot, as it combines the strengths of the phased and the big bang methods.