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- No causal findings - variable not manipulated (prolonged separation caused emotional problems experienced by thieves). Relationship only demonstrated. May be other variables that caused problems. E.g. discord in home caused prolonged separations and affectionless character. Or character caused separations. No causal conclusions can be drawn.
- Biased data - rich record of qualitative data on each participant, extensive interviews with children and families. Over 25 pages in report detailing case histories of thieves, advantage of providing insights into events that preceeded problems. Data limited - based on view of 1 person. Perceptions may be biased by own beliefs. Case histories largely biased on recollections of parents about events that occured years previously. Recollections inaccurate, portrayal of events positively, rosier picture of early childhood.
- Sample - all 88 children emotionally disturbed. May be appropriate to generalise from sample to all. May be delinquents no emotional disturbance and cause of delinquency may be more social than emotional. Useful to examine sample of children appearing in curt for stealing to determine whether all cases similar (Bowlby's suggestion).
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- 1 criticism - muddled together several different experiences.
- Separation alone may not cause long lasting damage, especially if good subsitutive emotional care. Research shown sensitive period in development - lack of emotional care before 6 months - children can recover - Rutter and Sonuga-Barke - romanian orphans.
- Bowlby's basic conclusion supported in subsequent research. lack of emotional care during key periods of development - lasting and serious consequences. Physical underdevelopment, intellectual retardation, difficulties in later relationships.
- Michael Rutter et al. 2010 - Romanian orphans who were adopted before or after 6 months. Those adopted later lagged behind control group of UK children on all measures of physical, cognitive and social development.
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