User Experience Assessment for Smart Products in IoT Environments: A Systematic Review

Smart products are increasingly embedded in everyday environments. Unlike traditional interactive systems, they operate across multiple touchpoints, involve multiple users simultaneously, and evolve over time through software updates, adaptive algorithms, and changing ecosystems. As a result, UX with smart products is shaped not only by task performance and usability but also by long-term processes of appropriation, agency calibration, and carry specific associated values and concerns. Despite this complexity, it remains unclear how current UX assessment methods account for these characteristics.This paper presents a systematic literature review investigating how UX has been evaluated in the context of smart and IoT products. Following PRISMA 2020 guidelines, 44 studies covering the last decade were selected from Scopus, ACM Digital Library, and Web of Science. The review identifies a persistent mismatch between the complexity of smart product experience and dominant evaluation practices. The contribution aims, on one side, at extracting methodological directions and, on the other, at conceptual reframing to shift evaluation practice: moving beyond the assessment of mere usability, and considering agency and control dynamics, as well as multi-user and multi-touchpoint dimensions.