The service sector is a key focus of the Fourth Industrial Revolution (IR4.0), a digital transformation that spans all industries. Central to IR4.0 is the adoption of emerging technologies such as artificial intelligence (AI), big data analytics, the Internet of Things (IoT), cloud computing, augmented reality, simulation, cybersecurity, systems integration, additive manufacturing, and robotics. Studies show that 59% of firms proficient in big data and IoT also utilize AI. Successful integration of these technologies enhances workforce capability and drives productivity growth. However, in Malaysia, industry readiness for IR4.0 remains at a low to medium level. This paper presents a systematic literature review to examine IR4.0 readiness models discussed in prior research. Six major databases—Scopus, Emerald Insight, IEEE, Springer, Web of Science, and Science Direct—were searched, yielding 10,428 records. After applying inclusion and exclusion criteria and a rigorous screening process, 55 relevant articles were selected for analysis. The findings reveal that IR4.0 readiness is often framed using theoretical constructs from success models, information systems theories, technology a
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