This book constitutes the first part of refereed proceedings of the 5th Computational Methods in Systems and Software 2021 (CoMeSySo 2021). The CoMeSySo 2021 Conference is breaking the barriers, being held online. CoMeSySo 2021 intends to provide an international forum for the discussion of the latest high-quality research results.

The software engineering, computer science, and artificial intelligence are crucial topics for the research within an intelligent systems problem domain.

Relationship between the Level of Economic Development and Education Level of the Employed Population.- Replacing the Reinforcement Learning (RL) to the Auto Reinforcement Learning (AutoRL) Algorithms to Find the Optimal Structure of Business Processes in the Bank.- Features of Using Programs for Casting Processes Modeling.- Development of an information system to help identify symptoms and predict the spread of COVID-19 using artificial intelligence.- Use of Analytic Hierarchy Process in Tasks of Knowledge Visualization.- Blockchain-Oriented Software Development issues: A literature Review.- Identification of Magnetic Levitation System.- The Optimal Model for Consumers' E-wallets Usage Intention.- Issues and possibilities of personal data remote processing in the COVID19 pandemic environment.- Oil Consumption Analysis in the Usa in Current Time.