Definition

Criterion sampling involves selecting cases that meet some predetermined criterion of importance (Patton, 2001, p. 238).

For example:

Every patient at a practice receives a satisfaction survey at the end of his or her visit. 

Satisfaction with how the patient felt his or her primary reason for visit was handled is assess via a 5 point likert scale with 1 = 'not at all satisfied' and 5= 'extremely satisfied.' 

To better understand patients who are not satistied with the care provided, the practice calls and conducts a telephone interview with all patients completing the survey who report a score of 2 or lower for this measure. 

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Why use this method?

Criterion sampling can be useful for identifying and understanding cases that are information rich.

Criterion sampling can provide an important qualiative component to quantitative data.

Criterion sampling can be useful for identifying cases from a standardized questionnaire that might be useful for follow-up. 

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