The first situation, termed My Class, represents a single intact class with an enrollment between five and sixty members. This is a convenience sample that is available to the TREE, but the results cannot be generalized because we have no way of knowing if or to what extent this group of students resembles the larger population of interest. As Warner (2008, p. 75) states, “At best, when researchers work with convenience samples, they can make inferences about hypothetical populations that have characteristics similar to those of the sample.” I interpret that to mean that a convenience sample might function as a pilot study to assist in defining the target population. A convenience sample might also help validate a data collection instrument, such as a questionnaire. Nunan (1992) illustrates this possibility: