An expert system

is advanced software that uses artificial intelligence algorithms, machine learning, advanced data-analysis techniques, including very large data sets, and data modelling issues in modern relational and object-oriented Databases.

A dedicated expert system

is a system designed in interdisciplinary teams with the participation of specialists on the part of the contractor and specialists on the part of the client ordering such a system. This approach allows the software to be perfectly tailored to the client's needs.

A dedicated expert system of advisory type

is a kind of software, the main task of which is to develop such analyses, recommendations and assessments of the state of the problem being solved, that will have a significant impact on the decisions made by the human expert.