Integration of functional disciplines – the ‘wheel within the wheel’. Well completions and sustaining production; optimizing efficiency of production systems: trading-off risk-adjusted CAPEX with discounted OPEX for life-of well management. From the reservoir to the well head and production train well completions and top side operations are symbiotically linked. Advances in systems engineering, automation, downhole instrumentation and data analytics are facilitating lower lifting costs and lower operational risk. SPE’s Technical Directors for Completions and Production & Facilities talk about their technical disciplines and how they and their advisory councils help capture shifting trends, future technology developments and gaps including those bridging these fundamental corner stones for oil and gas production.