Experimental archaeology is a multifaceted approach employed by a wide and rapidly expanding range of exponents including everybody from lab-based archaeological research scientists through to museum professionals and re-enactment groups. Scientific experiments are trials designed to test a hypothesis which will either be rejected (falsified) or validated. Validation does not imply truth, but demonstrates that the hypothesis is viable, though there may be equally viable alternatives. Experiments are the mainstay of almost all hypothetico-deductive science. Hence, one could define most archaeological science as being a form of experimental archaeology. However, most practitioners of experimental archaeology would view an attempt to replicate past activities and processes using authentic materials as an essential, defining aspect of the field. A laboratory scientist’s approach to experimentation is likely to minimize the variables being investigated at any one time while maximising control over conditions. Other experimental approaches, however, aim to see how processes work within life-like scenarios that involve authentic materials and variables. The term “actualistic” is often applied to such a mode of experimentation, alongside “reconstruction” and “replicative.” The best research often involves both controlled and actualistic experimentation to provide a sound understanding of individual variables and the interaction of many variables within realistic scenarios. These approaches are complementary and on a continuum. While some experimental archaeologists view their approach as an actualistic branch of hypothesis-based archaeological science, where the strict definitions of an experiment apply, others view the field as somewhat broader. Such practitioners value what can be learned from attempting to carry out activities, or even live, in conditions and with the materials that would be available in a particular time or place. This type of activity is often not based upon the testing of particular hypotheses but on experiential learning. Exponents of this approach will gain insights into the potential challenges faced by past peoples that might not otherwise occur to us or be reflected in the ethnographic record. Groups of practitioners that fall into this category might variously identify as being “re-enactors,” exponents of “living history,” “primitive technologists” or even “survivalists.” Thus, experimental archaeology can range from strictly scientific and objective methods to more subjective, experiential approaches, while retaining the essential aim of undertaking experiments which usually include actualistic activities using authentic materials. An additional noteworthy attribute of experimental archaeology is that re-enactment and reconstruction activities lend themselves particularly well to engaging forms of public presentation and education. As such, open-air experimental archaeology museums are currently expanding in number and visitorship. This field is expanding exponentially in almost every branch of archaeology making an individual section on every possible topic impossible, thus our approach is indicative and organized by broad themes of inquiry.