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Follow the sun (FTS) has interesting appeal—hand off work at the end of every day from one site to the next, many time zones away, in order to speed up product development. Although the potential effect on "time to market" can be profound, at least conceptually, FTS has enjoyed few documented industry successes because it is acknowledged to be extremely difficult to implement. In order to address this "FTS challenge," we provide here a conceptual foundation and formal definition of FTS. We then analyze the conditions under which FTS can be successful in reducing duration in software development. We show that handoff efficiency is paramount to successful FTS practices and that duration can be reduced only when lower within-site coordination and improved personal productivity outweigh the corresponding increase in crosssite coordination. We also develop 12 research propositions based on fundamental …