What is the requirement for items included in a preference assessment to yield the best results?

For a preference assessment to yield the best results, the items included should ideally be familiar to the individual. Familiar items allow for more accurate assessment of preferences because individuals are more likely to demonstrate their likes or dislikes based on previous experiences with those items. If the items are entirely new or unfamiliar, the individual may not be able to express a clear preference, as they lack the context or experience to make a choice.

Using items that a person has previously encountered enables the assessment to better capture their true interests and aversion. Familiarity can play a crucial role in how appealing or engaging an item is perceived to be, ultimately influencing the results and effectiveness of the assessment in guiding interventions.