Wilke J, et al. – Objective of this research was to analyze the reliability of assessing half–cycle cervical range of motion (ROM) applying a spirit level for calibration. They exhibited evidence that cervical ROM during half–cycle movements can be evaluated with excellent reliability using a spirit level. In contrast to subjective determination of the starting position, analyzing complete movement planes does not increase reliability. Applying a defined and objective zero positioning allows the evaluation of repositioning tasks.