Transformation of the philosophy of science during the last three decades is largely based on the philosophers? insights in the experimental side of science. Central issues in this new field, such as classification of basic elements and types of experimentation, are still developing. Subject of this work will be one of these types, Steinle?s ?exploratory experimentation? (EE), and its place in taxonomy of experimentation. After presenting an array of historical cases of experimentation, I analyze Elliott?s systematization of EE subtypes. I will claim that it does not represent development of Steinle?s ideas, although it can be used to improve taxonomy of experimentation in general. Special attention will be dedicated to the development of this taxonomy and understanding forms of experimentation not focused on theory testing - specifically EE.