The longitudinal research approach has the potential to provide rich data about the information systems life cycle and organizational and societal shifts due to information technology implementation and adoption. With this research methodology, we can discern changes in user behaviors and attitudes over time. Despite the promise of the longitudinal research approach, it has not been widely used in information systems research in the past. The aim of the current study is to inventory longitudinal research studies published during the past twenty years (1995-2015) and to provide a status report of this research method in the information systems field. The study will also identify gaps in longitudinal research in the information systems field and make recommendations to information systems researchers considering the adoption of longitudinal research methodologies in their work.