I titled this Technology Focus introduction “Wellbore Tubulars—When It Becomes Useless.” This may sound negative, but many advancements have been achieved in extending the life of the tubulars and maintaining tubular integrity. The question that remains in front of us, however, is how to monitor tubular integrity in real time. Managing well barriers and maintaining tubular integrity within limits is challenging for complex and aging wells because of many intervening variables. Material and strength degradation of tubulars subjected to constant or varying and concentrated or distributed loads during various operations result in different kinds of tubular failures. Predictive tools are needed for direct and indirect estimation of tubular integrity. Advances have been made to quantify metal loss effectively, thereby estimating strength degradation in a better way. Digital technology and high computing and processing speeds and novel technologies are providing additional impetus to extend the life of tubulars for long-term sustained production, minimizing negative effects on the environment. Recently, many new technologies borrowed from the horizontal-drilling industry have been applied effectively for downhole conditions to detect abnormalities in the tubulars. Now technology has advanced to monitor the metal loss of multiple casings at the same time. Some of the novel technologies involve microwave technology, pulsed-eddy-current technology, magnetic flux leakage, advanced sensors, and sensing technology based on fiber optics. I have selected a few papers that are structured toward this end, and readers can find additional reading on the OnePetro online library.