Following the good old AI traditions Sirma developed a number of "classic" expert systems.

Intelligent Workstation Architecture
A framework integrating knowledge bases, hypertext documents, active forms and databases in a highly interactive environment. The heart of the system is a boolean constraint propagation network which is best explained in [MarinovAlexievDjonev94]

Extrusion Tools Expert Selector
An extrusion tool management environment involving pattern matching and non-linear optimization techniques. ETES served as a basis for the ALEX Tool Matching system of EngView Systems.

EcoRisk
An intelligent environment for spill modeling and decision support for environmental emergencies based on substance characteristics database, geographical information subsystem, numerical models of environmental processes, knowledge-based decision support