In this paper, we address three forms of longitudinal timeline validity: time unit validity (which deals with the question of how to segment the timeline – weeks, months, years, etc.), time boundaries validity (which deals with the question of how long the timeline should be), and time period validity (which deals with the issue of which periods should be in the timeline). However, insufficient attention has been spent on understanding the unique validity and reliability issues related to the timeline that is either explicitly or implicitly required in a longitudinal case study. Management Information Systems researchers rely on longitudinal case studies to investigate a variety of phenomena such as systems development, system implementation, and information systems-related organizational change.
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