Yet not, the research you to then followed Bowlby’s fresh information focused first with the infancy period. This is from the theoretical build out-of hence accessory concept emerged, the developmental perspective within and therefore accessory research developed, as well as the hidden presumptions made regarding the products one activate attachment behavior and invite the newest class off attachment patterns (come across Schneider-Rosen 1990 getting an elaboration 
ones information). Because the 1980, conceptual habits and brand new strategies was delivered having offered the field of attachment (Bretherton 1985; Cassidy and Razor 1999; Greenberg, Cicchetti, and you can Cummings 1990).
Caused by these types of efforts is the fact these day there are numerous classification strategies open to determine personal differences in accessory relationships inside the infancy, young people, adolescence, and adulthood
The best and you can widely used level to assess models regarding attachment was Mary Ainsworth and you will Barbara Wittig’s Uncommon Condition (1969). In fact, it had been the introduction of that it standard procedure that led to this new rush out of look into personal differences in accessory habits and you may enabled questions regarding the brand new precursors to, and you can effects off, such different models as looked.