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Elastic Path software and Luxoft present in this case study a successful distributed agile project using outsourcing (both near and off shore). Elastic Path and Luxoft are both experienced agile practitioners, which helped immensely in so far as neither client nor vendor had to learn how to do agile while trying to overcome the difficulties in implementing agile in a distributed manner. The case study describes how Elastic Path and Luxoft overcame the challenges of daily meetings, the lack of face-to-face interactions, rapidly changing requirements, and rapid team size scaling all across a fourteen hour time difference.
Vax et al. (Tue,) studied this question.