A weakness is that the continuity hypothesis is deterministic. This is because it implies that those with insecure attachments are destined to have poor future relationships. However, research by Zimmerman et al. (2000) challenges this assumption, finding that life events and experiences, such as supportive relationships in adulthood, can alter attachment styles over time. This evidence suggests that early attachment influences are not necessarily permanent, and individuals with insecure attachment can develop healthier relationship patterns.