suggests behaviour is pre determined& do not have control over it
pro: allows us to predict & determine future behaviour
e.g can predict person with insecure att is more likely to bully
can prevent this from happening by ensuring secure att
con: ignores persons free will & choice
e.g in later life person may choose to form secure romantic relationship
does not take into account that people can choose how to behave
means cannot say issues in early att will always affect later relationships