In this paper the virtual testbed as a problem-solving environment is considered in different aspects.
Fundamental questions for virtual testbed development are (1) characteristics of mathematical models and
their interaction; (2) computational aspects and mapping of algorithms onto hardware; (3) information
streams and data smanagement. The authors propose the concept of a virtual private supercomputer as a
tool for virtual testbed computer environment. Examples of the implementation of the virtual testbed in
different areas are given. The article summarizes achievements of the authors in the field of virtual testbed
during last years.