Infrastructural projects based on public-private partnership (PPP) schemes usually struggle with large amounts of resources. Given such projects' relatively long lifetime, it is expected to encounter a wide range of risks when executing them. This implies that increasing productivity based on...

Virtualization is indispensable for a service-oriented IT infrastructure, and hybrid models are also obvious in research and teaching in order to use cloud environments and on-premises solutions equally. In addition to multi-cloud solutions, internal integration concepts are also important if an...

Production functions provide a mapping from the firms' input quantity and productivity to output quantity. This mapping only generates unbiased estimates if input and output quality variation within and between observation units is accounted for. I review and classify state-of-the-art methods to...