This book constitutes the thoroughly refereed proceedings of the international workshops associated with the 38th International Conference on Advanced Information Systems Engineering, CAiSE 2026, which was held in Verona, Italy, during June 2026. The 25 full papers and 8 short papers included in this book were carefully reviewed and selected from a total of 67 submissions to the workshops. They stem from the following workshops:  GenSyn 2026 ? the 2nd Workshop on Generation of Synthetic Datasets for Information Systems MIDas4CS 2026 ? the 4th Workshop on Modelling and Implementation of Digital Twins for Complex Systems LLM SOA 2026 ? the 2nd Workshop on Large Language Models for Service Oriented Architectures and Systems Design BC4ISE 2026 ? the 2nd International Workshop on Blockchain for Information Systems Engineering EASI 2026 ? the 1st International Workshop on Engineering Autonomous Systems Intelligence CAI 2026 ? the 2nd Workshop on Compliance in the Era of Artificial Intelligence HybridAIMS 2026 ? the 4th Workshop on Hybrid Artificial Intelligence and Enterprise Modelling.