Presiyan Prodanov focused on strengthening the association handling logic in the MontiCore/cd4analysis repository, addressing a critical bug in the Syn2SemDiff class. He improved the detection of deleted and modified associations, ensuring robust support for complex directionality, including reversed associations and abstract classes. Using Java and applying code refactoring and software design principles, Presiyan removed an unused dependency and introduced safeguards to skip abstract-class associations during retrieval. These targeted changes enhanced the correctness of association comparison and merging, reducing false positives and negatives in downstream processing. His work contributed to more maintainable and reliable diff and merge workflows.