Expert User Validation of Perceived Quality and Purchase Intention: Perspectives from Product Designers and Industry Practitioners
DOI:
https://doi.org/10.24191/idealogy.v11i2.1027Keywords:
Content Validity, Expert Validation, Perceived Product Quality, Purchase Intention, Sustainable Product DesignAbstract
A design model derived from user evidence requires professional content validation before it is used as a structured reference for design decisions. This study evaluates the content validity of a Sustainable Product Design Model (SPDM) comprising 37 indicators across seven criteria: form, function, safety, sustainability, quality, commerciality, and innovation. Thirty product designers and industry practitioners, each with at least five years of professional experience, completed a four-point relevance questionnaire administered face to face. Item level Content Validity Index (I-CVI), Scale level Content Validity Index using the average method (S-CVI/Ave), and modified kappa were calculated. All 37 indicators met the predetermined I-CVI retention threshold of 0.78. I-CVI values ranged from 0.80 to 1.00, with an overall mean of 0.94, while criterion level S-CVI/Ave values ranged from 0.88 to 0.98. Function recorded the strongest consensus (0.98), followed by quality (0.97) and form (0.95), whereas innovation recorded the widest variation in expert agreement (0.88). The analysis also examined indicators with lower agreement and the effect of converting the four-point scale into relevant and lower relevance categories. Stability, Price, Prestige Value, and Exclusiveness/Limited met the retention criterion but required clearer operational definitions. The study establishes a dual evidence validation approach that preserves priority derived from user evidence while expert evidence establishes content relevance, conceptual boundaries, and professional support for sustainable product design decisions.
Keywords: Content validity, Expert validation, Perceived product quality, Sustainable product design, Design decision support
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