The document outlines a client's project to migrate their tier 1 enterprise applications and infrastructure services from an existing data center to a new data center. It discusses the key tasks of determining what applications need to migrate, managing stakeholders and vendors, and creating tools to manage the migration. It then presents and analyzes four options for performing the migration - "forklift", "build new", "virtualize", and "serial number swap" - weighing the risks, impacts, costs, and resources required for each. It concludes by outlining the consultant's process for planning and executing the migration through a "playbook" approach.