Thomas, Chess and Birch (1977) - TEMPERAMENT
Aim: see whether ways of responding to environment stay stable throughout life
Method: 133 children studied from infancy to early adulthood. Kids' behaviour was observed and their parents were interviewed. Parents were asked about child's routine and its reactions to change.
Results: Kids fell into 3 types - easy, difficult or slow to warm up. Easy children were happy, flexible and regular. Difficult children were demanding, inflexible and cried a lot. Slow to warm up didn't respond well to change or new experiences to begin with, but once they adapted they were usually happy.
Conc: 3 ways of responding stayed with them as developed. Temperament is innate.
Eysenck (1947) - PERSONALITY