The overwhelming majority of modern information systems are built on the basis of a modular principle. This principle involves the creation of independent software subsystems that perform separate groups of tasks. The success of building an information system depends on the quality of the division of tasks into groups. Known approaches to modular partitioning are based on the organizational structure of the enterprise and job descriptions of employees. This leads to unmanaged intermodular connections and loss of the advantages of the modular approach (flexibility, interchangeability of modules, etc.). To solve this problem, the article proposes a new method for designing a modular structure of information systems based on the analysis of information and information flows. This allows minimizing inter-module communications and building systems that are independent of the organizational structure of the enterprise.

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In this paper there is proposed a method of user interface design, which is based on semantic model of user activity in the domain, which is formed by the end user himself in natural language, as a source data for design. This description is further transformed into a mechanism of action, the combination of which can be called a model. Also the paper contains the analysis of possible models used in model-oriented approaches to interface development, advantages and features of the proposed model are highlighted. Based on the model in the form of action mechanisms, the user interface of the information system is formed. The paper contains the general example of the process of user interface construction.

The model of an integration-variable concept is designed to store all the information necessary for user interface design. The use of such model will make it possible to design an interface that is adequate for the professional activity of the user. In this case, it is necessary to implement in the model the level of professional activity, the level of information activity, the level of presentation of the primary document, as well as the level of description of the rules for converting intermediate data into fields of primary documents. The method presented in the article is based on the use of a model of an integrationvariable concept.