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What does this quote mean "As attachment behavior develops, it forms the basis for an inferred attachment bond. Bowlby described particular phases of its development: pre-attachment (from birth to about 2 months), involving signaling without discriminating one person from another; attachment-in-the-making (2-6 months) where signals become directed to particular persons; clear-cut attachment (0.5-4 years) with locomotion and goal-corrected be- havior; and finally a goal-corrected partnership (4 years onwards) with perspective taking, communication skills, and sharing mutual plans. Although additional attachments may develop throughout life, early attachments endure" Children's Social Development within the Socialization Context of Childcare and Early Childhood Education by Carollee Howes and Jolena James.