Wolof people
A great deal of care should be taken in cross-cultural examinations of conservation in order to avoid obtaining biased results. For example, one study that tested adolescents belonging to the Wolof people of Senegal found they were not able to conserve in a conservation of liquid task. However another study suggests that their interpretation of the experimenter’s purpose may have conflicted with giving straightforward answers to the standard Piagetian questions because - except in school interrogation - Wolof people seldom ask questions to which they already know the answers. When presented with the task as language-learning questions about the meaning of quantity terms such as "more" and "the same", the responses reflected understanding of conservation.