" When the infants were between 6 and 9 months of age, caregivers in the experimental group were trained in sensitive responding. Then at 1 year of age, Strange Situation assessments were done. The effects of the intervention were dramatic. Compared with the control group, infants in the experimental group were almost three times as likely to show a secure pattern of attachment. Follow-up studies found that the effects of the intervention were enduring and were still evident more than 2 years later not only in child–caregiver relationships but also in child–peer interactions. "

― , Character Strengths and Virtues: A Handbook and Classification