This document reports the third iteration of the SliceNet Cognition Sub-Plane design and implementation. SliceNet Cognition Sub-Plane enables the Quality of Experience (QoE)-aware management of network slices. SliceNet QoE-aware slice management combines the established MAPE (Monitoring, Analysis, Planning, and Execution) autonomic control loop with state-of-the-art data-driven management and AIOPS (Artificial Intelligence for IT Operations). To this end, the components reported in this document provide the implementations of both analytical and actuation frameworks of the Cognition Sub-Plane, all governed through a data-centric approach. The current document also describes the role played by the Cognitive Sub-Plane in the SliceNet Use Cases, progress to the previous iteration’s analytic workflows, the position of SliceNet’s Cognition Sub-Plane against related 5G standards and other research projects. It also discusses how the Cognition Sub-Plane has achieved its goals and how it can be exploited beyond the scope of SliceNet.