Less power and status than adults.
More difficult for them to state their views openly, especially if challenging adult views.
Schools are hierarchal institutions that give teachers power over pupils.
Teachers can sometimes use this power to influence which students are selected for research.
Structured interviews or questionnaires tend to reinforce power differences as the researcher is the one who determines what questions are asked and how answers should be formulated.
Group interviews may be better than one-to-one formal interviews at reducing power differences.
The pupils’ attitude to the power differences has an effect as well – those who resent the power of teachers are less likely to cooperate in sociological research.