The First International Workshop on Model-Based Software and Data Integ- tion (MBSDI 2008), was our ?rst event of this kind in a forthcoming series of activities at TU Berlin, where a scienti?c discussion and exchange forum was provided for both academic and industrial researchers.We aimed at researchers, engineersand practitionerswho focus onadvanced,model-basedsolutions inthe area of software and information integration and interoperability. As withevery beginning,the resonanceonour callsin today s over?oodingof workshops was somewhat unpredictable, and we did not really know how many paper submissions to expect. We were nicely surprised, considering the rather short lead time to organize the meeting and the very specialized and focused topic. After the rigorous review process, where each paper received at least four reviews, we were able to accept nine regular papers and, additionally, we asked for extended abstracts fromour invited speakers.The selected papers mirrorthe main aspect and the mission of the workshop: to promote research in the ?eld of model-based software engineering, essentially focusing on methodologies for data and software (component) integration.