E&P operators with ageing assets are making informed investment decisions around financial commitments for later-life asset management through to full decommissioning and abandonment in a safe, environmentally sound and cost-effective way. Factors affecting decommissioning decisions include: Oil price, New technology, Regulatory requirements, Supply chain and contracting options. Operators are optimising the execution of decommissioning projects and consistently looking to improve efficiencies through decommissioning strategies, technologies and approaches. At the same time, a new focus on programmatic approaches, and the use of data are becoming more prevalent to eliminate waste and create cost saving opportunities. This paper provides: an overview on the decisions that need to be taken when commencing decommissioning activities; a review of the various models and strategies for decommissioning and abandonment; discussion on how traditional project approaches may not be appropriate in light of environmental and sustainability targets; and consideration of contracting options. The paper will appeal to E&P operators, major contractors and service providers.