Introduction to distributed systems and critical infrastructure systems (definitions, characteristics, real-time operations, definitions of software architecture and design patterns, etc.) Architecture features and application behavior (scalability, application performances, expendability, modularity and dependability, deployment, etc.) Basic software styles and their features (client-server, component-based architectural style, domain driven design architectural style, layered architecture, etc.) Styles of distributed software architectures (3-tier and N-tier architectures, distributed objects, Event-based and Message Bus architectures, service-oriented architecture, micro-kernel architecture, micro-services, Space-based architecture, Container-based architecture, etc.) Examples and implementations. The use in infrastructure system software model. Algorithms overview and data model in infrastructure systems. Numeric calculations in infrastructure systems.