She said: “Virtual laboratories are divided into two categories
depending on the methodology of presenting the knowledge on the subject area. Virtual laboratories where
presentation of knowledge on subject area is based on individual facts, are limited with the set of pre-programmed
experiments (this approach is more popular due its less complicated methodology). Another approach gives the
learners an opportunity to conduct any experiment, not being limited by the pre-programmed set of outcomes. This
is achieved by using the mathematic models allowing defining the result of any experiment and proper visual
presentation. Unfortunately, such models are available so far just for a limited set of experiments” (Tukenova, N. (2012).