Information technology (IT) departments are increasingly challenged to replace legacy applications with novel public cloud software as a service (SaaS) to innovate the organization's business processes. The resulting hybrid cloud is formed by integrating the added SaaS with existing IT services. The decision to adopt SaaS in such a hybrid cloud service composition requires appropriate consideration of the respective service level agreements (SLA) to ensure the proper execution of the supported business process. Previous studies focused strongly on cloud service selection or SLA negotiation rather than functionally desired SaaS adoption from the perspective of the hybrid cloud provider as integrator. This research paper identifies economic and technical issues in hybrid cloud arising from SaaS adoption and discusses challenges and existing solutions. A structured literature survey revealed that 52 issues in 36 identified publications are transferable to our context. These issues were classified in six different challenges. We were able to explore the relations between solution artifacts of various challenges and provide guidance for future research concerning hybrid clouds. The relations between the challenges are also found to vary in their research maturity and offer promising fields for further research.

信息技术 (IT) 部门面临越来越大的挑战，需要用新颖的公共云软件即服务 (SaaS) 替换遗留应用程序以创新组织的业务流程。由此产生的混合云是通过将添加的 SaaS 与现有 IT 服务集成而形成的。在此类混合云服务组合中采用 SaaS 的决定需要适当考虑各自的服务水平协议 (SLA)，以确保正确执行受支持的业务流程。以前的研究主要侧重于云服务选择或 SLA 协商，而不是从作为集成商的混合云提供商的角度来看功能上期望的 SaaS 采用。本研究报告确定了混合云中因采用 SaaS 而产生的经济和技术问题，并讨论了挑战和现有解决方案。一项结构化的文献调查显示，36 份已确定的出版物中的 52 个问题可以转移到我们的背景中。这些问题分为六个不同的挑战。我们能够探索各种挑战的解决方案工件之间的关系，并为未来有关混合云的研究提供指导。还发现挑战之间的关系在研究成熟度方面有所不同，并为进一步研究提供了有希望的领域。我们能够探索各种挑战的解决方案工件之间的关系，并为未来有关混合云的研究提供指导。还发现挑战之间的关系在研究成熟度方面有所不同，并为进一步研究提供了有希望的领域。我们能够探索各种挑战的解决方案工件之间的关系，并为未来有关混合云的研究提供指导。还发现挑战之间的关系在研究成熟度方面有所不同，并为进一步研究提供了有希望的领域。