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Software product quality is an important concern in the computer environment and whose immediate results are appreciated in all the activities where computers are used. The ISO/IEC 9126 standard series settle a software product quality model, for example, in the annex, shows the identification of the quality requirements like a necessary step for product quality. However, the standard does not included the way to get quality requirements, neither how to establish metrics levels. Establishing quality requirements and metric levels seems to be simple activities but they could be annoying and prone to errors if there is not a systematic approach for the process. This article presents a proposal for establishing product quality requirements according to the ISO/IEC 9126 standard.