Improvisation first became popular in Slovenia following the production of Variete - the tradition of improvisation theatre by the Ana Monró Theatre. The company subsequently founded the Impro liga ('Improvisation League'), which later developed into the more complex Improvisation Society of Slovenia.

Impro liga is now one of several complementary projects run by the Society, and takes the form of a competition in short form improvisation for schools and other groups from the regions. To date the series has involved over 100 successful shows at KUD France Prešeren Arts and Culture Association and resulted in a number of guest performances across Slovenia and abroad (Berlin, Vienna, Seattle, Graz).