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This project is a study of the development of the Rule Engine, which is a validation system for quality assurance of product data used in the grocery business. The authors was asked by Cogitare AS to develop the Rule Engine. A system where users without programming skills can build rules and validate product data. The main quality attribute focus is robustness and user friendliness. A survey has been used by the authors to be able to explore if our objectives have been achieved and to identify further work. The questionnaire has been conducted on students and software developers.