A further constraint is that the coding procedure results in discrete categories rather than continuously distributed dimensions. Not only is this likely to provide boundary problems, but also it is not at all obvious that discrete categories best represent the concepts that are inherent in attachment security. It seems much more likely that infants vary in their degree of security and there is need for a measurement systems that can quantify individual variation".
A further limitation is that the coding procedure produces distinct categories rather than continuously distributed dimensions. This not only creates boundary issues but also raises doubts about whether discrete categories accurately reflect the underlying concepts of attachment security. It seems more plausible that infants exhibit varying degrees of security, and a measurement system capable of quantifying individual variations is needed.