This book has been written by me based on my experience in pipeline integrity management for more than 39 years in oil and gas industry in India. I have worked in projects, construction, inspection, operation and maintenance, quality control and audit in oil and gas cross country pipeline. As a consultant in post-retirement period of 6 years, I have carried out pipeline integrity assessments of onshore and offshore pipelines together with prediction of fitness and residual life of pipelines suggesting mitigation measures. In addition, I have also trained integrity engineers.This book discusses important topics related to pipeline integrity such as integrity management process, threats to pipeline integrity and its assessment, Integrity assessment, tools for integrity assessment and its data analysis, in line inspection, External corrosion and internal corrosion direct assessment, corrosion monitoring, residual life assessment and fitness for purpose, mitigation, intervention and repair etc. Case studies and quiz test have also been included in this book for understanding and testing knowledge of the subject.I hope that the book will be very useful for asset integrity managers looking after asset integrity and provide inputs for taking decisions in carrying out integrity assessment and taking corrective measures.