Bidirectional transformations (bx) are a mechanism for maintaining the consistency of at least two related sources of information. Such sources can be databases, software models, documents, graphs, and trees. BX are an emerging topic in a wide range of research areas with prominent presence at top conferences in different fields. The workshop BX'12 now establishes a dedicated venue for bx in all relevant areas. The methodologies used for bx range from classical program transformation to graph transformation techniques, from ad-hoc techniques for data synchronization to the development of domain-specific languages and their integration. We also solicit papers on model/metamodel co-evolution, which is a different yet closely related subject. -------+++ Aims and Topics The aim of the workshop is to bring together researchers, established and new, interested in bidirectional transformations from different perspectives, such as: language-based approaches, software/model transformations, and data/schema co-evolution. Topics of interest for BX'12 include, but are not limited to: * (coupled) software/model transformations * software-model synchronization * data-schema co-evolution and data synchronization * consistency analysis * language-based approaches * analysis/classification of requirements for bx technologies * case studies and tool support * comparison of bx technologies * efficiency of algorithms and benchmarks Regular submissions (11-15 pages) can be: * research papers providing new concepts and results * position papers and research perspectives * papers that apply bx in new domains * papers closing gaps between formal concepts and application scenarios We also welcome submissions of short papers as well as abstracts for lightning talks.