This document discusses the evolution of service objects from basic implementations to more advanced features. It outlines what problems service objects aim to solve, including encapsulating business logic and making code testable. Initially, service objects were simple objects with a single public method. The document then discusses adding features like data creation/updating, validation, combinations, and callbacks. Existing implementation patterns are reviewed before describing the author's own implementation using callbacks and modularity. Future plans include improving error handling and validation functionality in a modular way. The document concludes by thanking the audience and providing the presenter's contact details.