This document discusses different methods for conducting retrospectives in Agile software development. It outlines several common retrospective structures including using three questions to gather data on what went well, what didn't go well, and what puzzles the team; using a starfish model to gather data on what to keep doing, start doing, stop doing, and less of; and using a timeline to map out significant, problematic, and good events over the project. The document also discusses setting the stage, gathering data, generating insights, deciding on actions, and closing out the retrospective. The goal of retrospectives is for teams to reflect on how to continuously improve.