<![CDATA[Product catalog websites must enable users to locate, understand, and act on product information efficiently; however, the existing website examined in this study exhibited unclear navigation, poorly organized product categories, inconsistent information presentation, and limited access to ordering channels. This study aimed to redesign the website using a User-Centered Design approach based on ISO 9241-210 and evaluate the resulting prototype across the effectiveness, efficiency, and satisfaction dimensions of ISO 9241-11. User requirements were identified through website observation, a semi-structured interview with the company owner, and questionnaires administered to 30 purposively selected respondents aged 18–30 years with prior experience searching for product information online. A Wix-based prototype was evaluated using Performance Measurement with five participants completing eight task scenarios and the System Usability Scale with 30 purposively selected respondents. The redesign introduced clearer navigation, improved product categorization, more consistent product information, search functionality, and easier access to WhatsApp-based ordering. Completion Rate increased from 77.50% to 92.50%, Overall Relative Efficiency from 50.06% to 84.32%, and mean System Usability Scale score from 66.83 to 80.08. These descriptively large improvements indicate better observed usability under the present evaluation conditions, rather than establishing causal effectiveness or broad generalizability. The findings support the value of combining objective task-performance measures with subjective usability assessment, while further validation with larger, more diverse samples and stronger comparative designs remains necessary.]]>
