This unit draws the guide together. It starts with the decision table, which scores server-side, hybrid and headless on six dimensions and points each verdict back to the page of this guide it rests on, so the other units are the detail behind every row. The case studies come next: four production sites and the headless question, each with the shape and engine chosen, why it fits, and what to copy or do differently. The unit ends with migration paths, for a team that has launched and wants to change course, sized honestly so that nobody plans a rewrite as a refactor.
Bring the decision table to the kickoff meeting. Come back to the migration paths before any change of shape or template engine on a live site.