The participants were collected using an opportunity sample
On arrival the children were given a mental test given by a psychologist to assess their intelligence. the Binet scale was used
Whilst the test went on the psychologist also noted down the emotional attitude of the child
The mothers of the children where also interviewed by a social worker and noted down preliminary details of the child’s early psychiatric history
Both the psychologist and social worker reported back to the psychiatrist, Bowlby. The psychiatrist then interviewed the child and mother
after the two hour examination the team considered school reports and discussed their conclusions.
The children then went on to meet with the psychiatrist weekly over a period of six months or more. the mothers also talked over their problems with the social worker.
These meetings and discussions enabled detailed case history to be recorded, and also enables the psychiatrist to diagnose the children’s emotional problems