Choosing participants for a study based on their experience with the phenomenon being studied, and their willingness and ability to expound on their experience at length and in their own words, is called .

Purposive sampling

Explanation:

Purposive sampling, apopularly known as judgmental, selective, or subjective sampling. It is a form of non-probability sampling in which researchers take the risk of relying on their own judgment when choosing specimen of the population to participate in their study. 

This sampling method demands that researchers must have known about the purpose of their studies so that they can appropriately choose and approach eligible participants. 

Researchers use purposive sampling when they want to access a particular group of people, a particular profile of people normally fit the criteria to be selected..

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