The Basque WordNet follows the EuroWordNet framework and, basically, it is produced using a semi-automatic method that links Basque words to the English WordNet. We have found that in order to ensure proper linguistic quality and avoid excessive English bias, a double manual pass on the automatically produced Basque synsets is desirable: a first concept-to-concept pass to ensure correctness of the Basque words linked to the synsets, and a word-to-word pass to ensure the completeness of the word senses linked to the words. By this method, we expect to combine quick progress (as allowed by a development based on the English WordNet) with quality (as provided by a development based on a native dictionary). We have completed the concept-to-concept review of the automatically produced links for the nominal concepts, and are currently performing the word-to-word review.