Crowdsourced software development (CSD) has gained increasing popularity in software engineering. However, empirical evidence on its sustainability remains limited. Although previous studies have suggested several sustainability-related factors, their applicability in real industrial CSD environments lacks sufficient validation. Through a systematic literature review (SLR), we identified eleven factors affecting sustainability in CSD. This study empirically validates these factors via a questionnaire survey with practitioners from various crowdsourced software development platforms. The results confirm that all eleven factors identified in the literature are also recognized by practitioners,... More >