Conclusion: While the increased adoption of public IaaS1 can reduce cost and simplify technology procurement challenges, IaaS does not meet all IT organisations’ sourcing requirements such as legacy applications maintenance and IT service management. Hence, IT organisations are left with no alternative but to use multiple service providers to satisfy all their needs. This will increase clients’ governance cost of service providers and extend the duration of external services acquisition. As a result, a service broker model has emerged to provide one single point of accountability to all sourcing deliverables, simplify go-to-market strategies and fulfil the Cloud migration requirements in a cost-effective manner. IT organisations should assess the applicability of this model to their environment.