|Formulation Text=A theory is said to be used if it is taken as an adequate tool for practical application.
|Authors List=Hakob Barseghyan,
|Formulated Year=2015
|Description=Traditionally, the terms ''acceptance,'' ''use,'' and ''pursuit'' have not been distinguished. Confusion between the three terms leads to serious misunderstanding, thus their clarification is of great importance. [[CiteRefTODO::Barseghyan (2015)|p. 30]]Description here
|Resource=Barseghyan (2015)
}}
|Accepted From Day=1
|Accepted From Approximate=No
|Acceptance Indicators=The definition became ''de facto'' accepted by the community at that time together with the whole [[The Theory of Scientific Change|theory of scientific change]].