This book constitutes the refereed post-proceedings of the 9th International Conference and 10th International Conference&nbsp;on&nbsp;Model-Driven Engineering and Software Development,&nbsp;MODELSWARD 2021 and&nbsp;MODELSWARD 2022,&nbsp;was held virtually due to the COVID-19 crisis on February 8-10, 2021 and February 6-8, 2022.<div><br></div><div>The 11 full papers included in this book were carefully reviewed and&nbsp;selected from 121 submissions. The purpose of the International Conference on model-driven engineering&nbsp;and software development is to provide a platform for researchers, engineers,&nbsp;academics as well as industrial professionals from all over the world to present&nbsp;their research results and development activities in using models and model&nbsp;driven engineering techniques for system development.</div>