The topic of this final thesis is processing the peculiarities of business-designed ERP systems using CASE tools in a modern environment. The problem investigated in the final paper entitled “Peculiarities of business-designed ERP systems - CASE in the modern environment” is the functioning and peculiarities of business-designed ERP systems in modern conditions and the environment in general. Namely, we are talking about special conditions during the COVID-19 pandemic, and especially observed in the context of aspects of sustainability - economic, sociological, ecological, technological and others, as selected project specificities of their activity, functioning and work of ERP. The task (and fundamental goal) of this final thesis is to highlight the most important peculiarities of the adaptation of business-designed ERP systems in modern and dynamic, digitally transformed, project conditions and the so-called to the “new normal” environment in general, and especially during the pandemic, whether it is product development or bundled with a whole range of services provided in general or in the changed environment and conditions of the pandemic. The goal was to succinctly show how and what challenges developers (development engineers, etc.) of business-designed ERP systems face, especially during a pandemic and similar conditions, especially during and in the domain of ERP system work and development with the help of CASE tools and in a modern environment. The methods that will be used are classical and comparative analysis and synthesis, a projectoriented approach, etc. Peculiarities of business-designed ERP systems - CASE in a modern environment.