Engineering assessments represent one of the most holistic and comprehensive evaluations of a pipeline’s integrity. As per regulations and industry standards engineering assessments are required to support operational changes to pipelines including reactivation of a discontinued pipeline significant increases to operating pressure or changes in service fluid. In addition engineering assessments are often included in operational audits – both internal and external – to evaluate the effectiveness of a pipeline’s integrity management program and can provide a basis for planning future inspection and mitigation activities. When properly executed an engineering assessment will highlight existing threats and hazards in need of mitigation and will also identify unmanaged threats and areas where little information exists facilitating improvement to integrity management.Engineering assessments are complex multidisciplinary reports that require careful planning to ensure that all potential threats to a pipeline’s integrity have been considered and assessed in accordance with industry standards. A well thought-out methodology is necessary to ensure that the engineering assessment covers all regulatory requirements and addresses all known threats.This paper describes an in-depth methodology for carrying out engineering assessments on pipelines. It will outline industry best-practices for evaluating threats and provide criteria for planning future integrity management activities based on the assessment’s findings.