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This is part I of the follow-up lecture notes of the lectures given by theauthors at the Three \CO" (Composability, Comprehensibility, Correctness)Winter School held in Ko\v{s}ice, Slovakia, in January 2018, and Summer Schoolheld in Budapest, Hungary, in June 2019. In this part we explain the role offunctional programming paradigm in the management of complex software systems,and how the functional programming concepts play important role in thedesigning such systems. Key prerequisite for implementing functionalprogramming concepts is properly designed system structure following welldefined design principles and rules. That is the main goal of this lecture tointroduce students with proper system modeling. Furthermore, we also explainhow new emerging technologies are designed in such a way that they enforce thedevelopment of systems that comply to the design rules inspired by thefunctional programming. This is extremely important in view of the currentnetwork evolution and virtualization concepts, which will require manyfunctional programming concepts in the network services and functions, as willbe discussed in part II of these lecture notes. These notes provide anintroduction to the subject, with the goal of explaining the problems and theprinciples, methods and techniques used for their solution. The worked examplesand exercises serve students as the teaching material, from which they canlearn how to use design principles to model effective system structures. Herewe focus on students understanding of importance of effective system structuresfor coordination of development and management processes that are driven bybusiness goals and further evolution.

The Role of Functional Programming in Management and Orchestration of  Virtualized Network Resources Part I. System structure for Complex Systems  and Design Principles