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      <title-group>
        <article-title>. IT-Subsystem of Construction Company Reengineering Project: Choice of Models</article-title>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author">
          <string-name>Bushuyev Sergey</string-name>
          <email>sbushuyev@ukr.net</email>
          <xref ref-type="aff" rid="aff1">1</xref>
        </contrib>
        <contrib contrib-type="author">
          <string-name>Puziichuk Andrii</string-name>
          <email>a.puziichuk2018@meta.ua</email>
          <xref ref-type="aff" rid="aff0">0</xref>
        </contrib>
        <aff id="aff0">
          <label>0</label>
          <institution>Ph.D. student, Kyiv National University of Construction and</institution>
          ,
          <addr-line>Architecture</addr-line>
          ,
          <country>Ukraine, Kyiv</country>
        </aff>
        <aff id="aff1">
          <label>1</label>
          <institution>Sc.D., professor, Kyiv National University of Construction and</institution>
          ,
          <addr-line>Architecture</addr-line>
          ,
          <country>Ukraine, Kyiv</country>
        </aff>
      </contrib-group>
      <abstract>
        <p>The relevance of reengineering processes of construction companies is determined. Defined the place of the IT reengineering project in the activity of improving processes. The typical IT systems of a construction company requiring reengineering are highlighted. The necessary elements of the content of the IT reengineering project are determined. The model of IT reengineering project in the form an "input-output" is developed. The proposed principles of building the "As Need" models for describing the business processes of a construction company. These researches will promote the development of managerial efficiency of construction companies. Perspectives of further research in the chosen direction are outlined.</p>
      </abstract>
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      <p>Determine the necessary elements of the content of the IT reengineering project:
- Database of notations (standards) describing business processes;
- Rules for choosing notations (standards) for describing business processes for a project;
- A set of software products for describing business processes in the selected notation;
- Rules for selecting a software product for describing business processes in a construction company
reengineering project;
- The base of models "As is" that will be built as a result of the project;
- The base of models "As Need", which is made up of a standard set of solutions;
- "As Need" models that are not standard but will be developed within the IT reengineering project;
- Rules for constructing models "As Need";
- Limitations and exclusions from the rules of constructing models "As Need";
- Rules of changing the rules of constructing models "As Need";
- Description of Business Processes «As Need»;
- Official duties of the personnel, provisions on the construction company's departments, roles responsibilities
of the participants in the project activity of the construction company.</p>
      <p>The model of the IT reengineering project in the form an "input-output" is presented in Figure 1. The model
includes the inputs (necessary information and systems) for the project, the content of the main processes of the IT
reengineering project, the necessary information resources and outputs (results) of the project.</p>
      <p>Particularly important element of the content of the project is, in our opinion, the rules for building models "As
Need". The development of such rules requires taking into account the specifics of the construction company in which
the project is being implemented. However, we can formulate the general principles that will form the basis of such
rules.</p>
      <p>Principle of reasonable detail of processes. The number of hierarchical levels that will describe the processes
should be expedient. It should not be large enough to not complicate the understanding of the process, and not small
enough to reveal the depth of the processes sufficiently. Consequently, a reasonable compromise must be found.
Typically, the number of hierarchical levels should be 3-4 levels.</p>
      <p>The principle of reasonable coverage of processes for reengineering. It is inappropriate to immediately improve
all processes in the company. And so it is necessary to choose some critical set of processes. They should be enough
to start effective reengineering. If they are not enough, this will not allow a breakthrough in efficiency. If there are
many, the company may not be able to make the transition to new processes, and roll back. However, the image of
reengineering will suffer, and the corresponding projects in the future will be doomed to failure. Consequently, it is
also necessary to find a compromise in the number of processes. As a general rule, it is recommended to select several
main and several auxiliary business processes.</p>
      <p>Fig. 1. IT-reengineering project of a construction company in the form of an "input-output" model
Principle of permanent development of reengineering. The reengineering project, which involves improving
some of the company's processes, should start a permanent improvement. That is, the project should provide the basis
for the implementation of such projects in the future, or transfer of reengineering activities to the operating activities.
This is possible provided that a unit in the construction company is set up, whose responsibilities include reengineering
processes.</p>
      <p>The principle of conformity of standards and IT tools to describe business processes to the level of competence
of construction company personnel. Any development is possible only in an environment that is ready for
development. The complexity of models and reengineering tools should be such that it can be mastered by the
company's staff. Therefore, it is necessary to correlate the complexity of models and the level of competence of staff
when choosing reengineering tools.</p>
      <p>Conclusions. The processes of management of construction companies need constant improvement. You
can start this upgrade by implementing a company reengineering project. In this project, improvement the IT
subsystem of the company's management is important. Therefore, it is possible to isolate a separate project of IT
reengineering. This article highlights the typical IT systems of a construction company that needs to be reengineered,
identifies the necessary elements of the content of the IT reengineering project, develops a model of the IT
reengineering project in the form of "input-output", proposes the principles of constructing "As Need" models for
describing the business processes of a construction company. These results will promote the development of
managerial efficiency of construction companies. Further research may be aimed at developing models and methods
for conducting proactive reengineering, with the perspective of constructing such models and methods with use
valueoriented approach.</p>
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