The invention concerns a model transformation unit adapted to transform a first source model in a source domain into a target model in a target domain, the first source model being a tree of source elements and the target model being a tree of target elements representing a project to be implemented in computer code, the model transformation unit including at least one memory adapted to store the first source model (104, 106), a source meta-model (204) representing the source domain, a target meta-model (206) representing the target domain, and a transformation model (210) indicating rules for transforming between the source meta-model and the target meta-model; and a transformation engine (102) adapted to determine, based on the transformation model, a parent element of each target element of the target model to be generated and to construct the target model by generating, for each source element in the source model to be transformed, a target element based on the transformation model, and by positioning each target element in the tree of target elements below its parent element.