The goal of is this study is to investigate the reliability and validity of a classification system for neck pain patients. In a previous study clinical experts were asked about the clinical criteria they considered to be determinative for 5 predefined dysfunction patterns in patients with neck problems: 1) articular, 2) myofascial, 3) neural, 4) central, and 5) sensorimotor control dysfunction pattern. This Delphi survey revealed a list of pertinent anamnestic and clinical criteria per dysfunction pattern.