AO3 - Research lacks temporal validity.
E: Schaffer and Emmerson’s research into primary attachment was conducted in 1964 when most mothers stayed at home and fathers worked.
E: Therefore, does not match the dynamics of modern family’s were many fathers stay at home so are more likely to become a child primary attachment figure. Since the role of the father has changed over time.
L: Therefore, results from this study cannot be generalised to the modern population.