Schaffer and Emerson Study - 1964
• 60 infants from working - class homes in Glasgow
• Aged between 5 to 23 Weeks - Studied until the age of 1 year
• Mothers were visited every 4 months, at each visit mothers reported their infants response to separation in seven everyday situations
• The mother was asked to describe the intensity of any protests which was then rated on a four Point scale and was asked to say to whom the protest was directed at