A series of domains like administration, engineering, new technologies, social intervention, agriculture or medicine have dealt very fully with the "best practices" subject matter. An analysis of these domain’s publications in French, English and Spanish reveals that the definitions adopted are numerous as well as the means used to evaluate applicant practices to the "best" title. Therefore "best practices" appear as a constellation that should be studied in depth in order to draw the matrix of their categories. This would greatly help new fields like museology to choose amongst the variety, the type that best fits its expectations.
Keywords: Best practices, definition, means of evaluation, matrix, museology.