QU as in qualification: meeting or exceeding expectations.
FLOW as in workflow: way of working to reach goals.
PERF as in performance: how good a function is compared to user expectations.
ECO as in economical-logical: how cost and resource efficient a design is compared to product targets.
All these aspects are intimitely connected with product quality: Quflow makes all qualities grow at a steady pace and Perfeco ensures those qualities perform well in all target systems.