摘要：The possibility of a minimalist derivation being equated with on-line computation is caused into question. Formal solutions are explored, in the context of an Integrated Model of Linguistic Competence, for solving the problems that such an equation presents regarding the directionality of the derivation vis-à-vis incremental processing and costless movement operations. A mixed top-down/ bottom-up model is proposed, which relies on parallel derivational spaces. Sequential and simultaneous copies in the course of the derivation distinguish movement with and without computational cost.
