Abstract:This paper assesses the applicability of client side Internet technologies in software solutions for critical infrastructure systems (CIS). It contains an in-depth analysis of four significant and well known development platforms, namely JavaScript with jQuery, the Google Web Tookit, Microsoft's Silverlight and Adobe's Flash/Flex. They were compared by using the ISO software quality characteristics as comparison criteria. Each of the technologies was applied in a real-life project and the results summarize the authors' experience. The ultimate goal of this research is to enable software engineers to more easily choose a client-side Internet technology when developing a new software solution for the CIS domain.