In our heads, content migrations are executed on a blank canvas, free from restrictions or limitations. Sadly, in the real world, migrations have baggage -- you're limited by the existing base of content, the platforms you're migrating both to and from, the capabilities of your team, the potential lack of vision around the project, and the list goes on and on. The best way around these limitations is to face them head-on, acknowledging that your migration might be a dirty, messy affair. David does a great job in this book of lifting the lid on these dirty, messy problems and helping you get our in front of them, instead on letting them run you over late in your project's schedule. Consider his Migration Handbook as a big, fat reality check.