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This paper describes CrowdREquire, a platform that supports requirements engineering using the crowdsourcing concept. The power of the crowd is in the diversity of talents and expertise available within the crowd and CrowdREquire specifies how requirements engineering can harness skills available in the crowd. In developing CrowdREquire, this paper designs a crowdsourcing business model and market strategy for crowdsourcing requirements engineering irrespective of the professions and areas of expertise of the crowd involved. This is also a specific application of crowdsourcing which establishes the general applicability and efficacy of crowdsourcing. The results obtained could be used as a reference for other crowdsourcing systems as well.