Another issue is that much of the research into the father’s role suffers from cultural bias. The majority of studies are conducted in Western, individualist societies where nuclear families and specific gender roles are the norm. In contrast, in collectivist cultures, caregiving is often more evenly shared between extended family members, and fathers may take on different roles. This means that findings such as Geiger's (1996) conclusion that fathers are mainly playmates may not apply universally. Therefore, the research lacks cross-cultural validity and may not be generalisable to non-Western contexts, reducing its external validity.