One of the more long-standing debates regarding attachment theory is whether and how the knowledge and expertise obtained from attachment-related research might be applied in clinical practice. In 2003, a group of researchers from the Center for Child and Family Studies at Leiden University undertook a meta-analysis in order to try and understand what kind of interventions had been more or less effective. They found that, overall, the more effective interventions were those based on a small to moderate number of sessions (fewer than 16) and which focused on observable behaviour: hence the title of their paper Less Is More. They also found that interventions that were more effective in enhancing the attunement and sensitivity of the attachment fi gure were the most effective in enhancing the attachment security of the child (an experimental finding which supports the hypothesis that sensitivity has a causal role in shaping attachment security).
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