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This article seeks to demonstrate the utility and pertinence of the rhetorical moves outline for the linguistic description, teaching and learning of professional letters, common discourse genres in the professional scope. Through the study of a corpus of 125 Job application letters written by Operations and Logistics Engineering students of Universidad de Panamá, all of them based in a model. In this corpus, rhetorical moves and discursive strategies in the letters were identified and described, then these were compared with the rhetorical model and the proportion of letters which followed it and, therefore, achieved their communicative purposes, was stablished. Based on the results, it could be observed that a 79% of the letters of the corpus followed the model, thus, the differences in their quality were detected in the discourse strategies within the moves. It can be concluded that following the moves model allowed the students to focus in producing letters of better quality with the possibility of achieving their communicative purpose in a real professional context. These results prove that the proposed model is valid to explain, teach and learn the peculiarities of the language and communication of the different professional cultures of the modern human activities.