It is sampling based on personnel opinion of what is representative of the population under study. It may be useful in pilot studies but does not generally result in warranted inference to any population of interest.
Cite this page: N., Sam M.S., "JUDGMENT SAMPLING," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/judgment-sampling/ (accessed March 21, 2023).