This article, published by performance management software vendor 15Five, addresses the question of whether organizations should use an HRIS platform or a dedicated performance management platform (PMP) for managing employee performance. The central argument is that HRIS platforms are well-suited for administrative consistency, compliance, and record-keeping, but are structurally limited when performance management is expected to drive behavioral change, support managers in real-time, or connect to compensation decisions in meaningful ways. The article presents a series of functional gaps attributed to HRIS performance tools — including inflexible review structures, fragmented compensation linkage, limited AI utility, and static goal tracking — and contrasts these with the design philosophy of dedicated PMPs. It concludes that most organizations benefit from running both systems in integration, with the HRIS serving as the system of record and the PMP supporting conversations and decision-making. The article includes a decision framework to help HR leaders determine which configuration fits their organizational maturity and performance expectations. Key insights: HRIS performance tools are optimized for process completion and consistency, which can create friction when organizations expect performance management to drive qualitative behavioral change rather than administrative compliance. The article identifies five functional gaps where HRIS platforms strain under performance management demands: review flexibility, compensation linkage, AI-assisted review quality, and goal cascading. Manager disengagement is framed as a systemic design issue — HRIS tools prompt compliance-driven participation, while dedicated performance platforms are described as designed around how managers actually think and work. Practical takeaways: Organizations primarily using annual reviews for documentation and compliance may find HRIS performance features sufficient without requiring a dedicated platform. When HR teams report significant manual data reconciliation, uneven manager adoption, or compensation decisions that are disconnected from performance records, these are described in the article as signals that a dedicated PMP may address structural gaps.