One of the key goals of digital transformation in Europe is to transfer 100 % of public services online, in particular, by 2030, all key public services should be online. This process requires the creation of comprehensive services that combine several services provided to the user on one application. The introduction of comprehensive services significantly unloads work of the bodies providing services and significantly simplifies the process of obtaining the results of services for users. Thus, the introduction of comprehensive services significantly improves the process of providing public services for all participants in the process. The formation of complex services is carried out solely on the principle of combining according to a life (business) event or situation. However, as practical experience shows, users often apply for several services at the same time, and these services are not connected by one life event. This can be seen by analyzing statistics on the provision of services by service centers. The use of statistical analysis methods makes it possible to identify a hidden relationship between services. Based on this, a new principle of combining services is formulated. The object of this research is the process of forming a portfolio of services based on this principle. An algorithm for forming a portfolio and providing recommendations for a decision maker has been developed. Recommendations are represented in the form of sets of services that can be included in the portfolio. The application of this principle will expand the range of comprehensive services at the expense of new portfolios. This will simplify and improve the process of providing services for both authorities and users. An example of creating a portfolio of services is considered and recommendations for the application of the proposed methodology are given. Dataset of 84 services was analyzed, it was recommended to create 2 portfolios

The formation of complex services is carried out exclusively according to the principle of association based on a life (business) event or situation. But as practical experience shows, users often request several services at the same time, and these services are not connected by one life event. This can be seen if you analyze the statistical data on service delivery by service delivery centers. The application of intelligent data analysis allows to reveal the hidden relationship between services. Based on this, a new principle of combining services was formulated. The object of research is the process of forming a portfolio of services based on association rules. An algorithm for forming a portfolio and providing recommendations for a decision-maker has been developed. Recommendations are presented in the form of sets of services that can be included in a portfolio. The application of this principle will allow to expand the set of complex services due to new portfolios. This will simplify and improve the service delivery process for both authorities and users.

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9. Al-Ammouri A., Dyachenko P., Degtiarova A. Development of a mathematical model of information serial redundancy of management information systems of the aircraft fire alarm // Eastern

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