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Model transformations constitute a key technology for model-driven software engineering. In round-trip engineering processes, model transformations are performed not only in forward, but also in backward direction. Since defining forward and backward transformations separately is both awkward and error-prone, bidirectional transformation languages provide a single definition for both directions. This paper evaluates the transformation language QVT Relations (QVT-R) which allows to specify incremental bidirectional transformations — as required for round-trip engineering for propagating changes in both directions — declaratively at a high level of abstraction. We apply QVT-R to a well-known benchmark example, the Families to Persons case. This case study demonstrates a number of limitations of the QVT-R language which result from the strictly state-based design of the language as well as from the way in which the semantics of QVT-R transformations

Incremental Bidirectional Transformations: Applying QVT Relations to the Families to Persons Benchmark