This integrative evidence review examines psychological safety and cross-functional innovation performance by asking how psychological safety is connected to cross-functional innovation performance and which conditions determine whether that connection becomes operationally meaningful. The article synthesizes peer-reviewed and institutional literature relevant to people, leadership, work-design, and organizational change systems, emphasizing mechanisms, boundary conditions, and measurement choices rather than a universal average effect. Evidence associated with Edmondson et al., 2014 and Marler et al., 2017 is read with the wider source set to distinguish formal adoption from effective use, short-term response from durable capability, and observed association from causal interpretation. The synthesis identifies complementary roles for psychological safety and voice, digital literacy, and governance or coordination routines. No survey, interview, experiment, proprietary dataset, or regression estimate is represented as having been collected for this conceptual review.
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